Proxmox Mail GatewayDeployment Guide 5/21/2010 MailGatewayDeploymentGuide-V1.8.docx Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] www.proxmox.com Proxmox Server Solutions GmbH reserves the right to make changes to this document and to the products described herein without notice. Before installing and using the software, please review the latest version of this document, which is available from http://www.proxmox.com. NOTE: A license to the Proxmox Software usually includes the right to product updates for one (1) year from the date of purchase. Maintenance can be renewed on an annual basis. All other product or company names different from Proxmox may be trademarks or registered trademarks of their owners. Copyright © 2010 Proxmox Server Solutions GmbH. All rights reserved. No part of this publication may be reproduced, photocopied, stored in a retrieval system, or transmitted without the express prior written consent of Proxmox. © 21.05.2010 Proxmox Server Solutions GmbH 2 49 Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] www.proxmox.com Table of Contents 1 2 Introduction .................................................................................................... 5 Proxmox Mail Gateway Integration ..................................................................... 6 2.1 E-mail system without Proxmox ................................................................... 6 2.2 E-mail system with Proxmox ........................................................................ 6 2.3 Proxmox in the Intranet .............................................................................. 8 2.3.1 Default port settings ............................................................................ 8 2.3.2 Alternative port settings (e.g. for MS Exchange) ..................................... 8 2.4 Proxmox in DMZ (demilitarized zone) ...........................................................10 2.5 Proxmox with multiple e-mail server and mail domains ..................................11 Performance Tuning ........................................................................................12 3.1 Hardware benchmarks ...............................................................................12 3.2 Backup MX ...............................................................................................12 3.3 Local DNS cache........................................................................................12 3.4 Blocking Emails on SMTP level ....................................................................13 3.4.1 Greylisting.........................................................................................13 3.4.2 Sender Policy Framework – SPF ...........................................................14 3.4.3 Real time Blacklists (RBL)....................................................................14 3.4.4 Local DNS RBL cache – Spamhaus Datafeed Service ...............................15 3.4.4.1 Configuring local DNS blacklist caches ............................................15 3.4.5 Receiver Verification ...........................................................................16 3.4.5.1 Proxmox Solutions .......................................................................16 3.4.5.2 Enabling Verify Receivers ..............................................................17 3.4.5.2.1 Settings for Exchange 2003 SP2 ..................................................18 3.4.5.2.2 Settings for Exchange 2007 SP1 ..................................................21 Rule System ...................................................................................................22 4.1 Default Rules ............................................................................................24 4.1.1 Block Viruses .....................................................................................24 4.1.2 Virus Alert .........................................................................................24 4.1.3 Block Dangerous Files .........................................................................25 4.1.4 Mark Spam ........................................................................................25 4.2 Custom Rules............................................................................................26 4.2.1 Enable Spam and Virus quarantine .......................................................26 4.2.2 Enable Spam quarantine for just a selection of users ..............................26 4.2.3 Enable Spam quarantine for existing LDAP users ....................................27 4.2.4 Block Spam e-mails with a score higher 10 ............................................29 4.2.5 BCC object – An simple archive solution ................................................33 4.2.6 Block Video and Audio Attachments ......................................................33 4.2.7 Add Admin Notification to Rules ...........................................................34 4.2.8 Preventing directory harvesting attacks with LDAP object ........................34 4.2.9 Block Video and Audio Attachments for LDAP Groups ..............................35 Proxmox HA Cluster – High availability ..............................................................37 5.1 Load Balancing with MX Records..................................................................38 5.2 Multiple Address Records ............................................................................39 5.3 Using third party Firewall features ...............................................................39 Hardware selection and Virtualization ................................................................40 6.1 Physical Hardware .....................................................................................40 6.1.1 Certified Hardware .............................................................................40 6.2 Proxmox VE (http://pve.proxmox.com) ........................................................40 6.3 VMware™ .................................................................................................40 6.3.1 Settings for VMware™ ESX, ESXi and vSphere .......................................41 6.3.1.1 Settings for the Proxmox Mail Gateway Virtual Machine ....................41 6.3.1.1.1 RAM settings .............................................................................41 6.3.1.1.2 VMware Tools............................................................................41 6.3.1.1.3 Enable VMI Paravirtualization ......................................................41 6.3.1.1.4 Enable time synchronization .......................................................42 3 3 4 5 6 © 21.05.2010 Proxmox Server Solutions GmbH 49 Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] www.proxmox.com 6.3.2 Settings for a VMware™ Server 2 .........................................................42 6.3.2.1 Host memory settings...................................................................42 6.3.2.2 Settings for Proxmox Mail Gateway Virtual Machine ..........................43 6.3.2.2.1 RAM settings .............................................................................43 6.3.2.2.2 VMware Tools............................................................................43 6.3.2.2.3 Enable VMI Paravirtualization ......................................................43 6.3.2.2.4 Enable time synchronization .......................................................44 6.4 OpenVZ....................................................................................................45 7 Troubleshooting and technical support ...............................................................47 8 Table of figures ...............................................................................................48 9 Appendix .......................................................................................................49 © 21.05.2010 Proxmox Server Solutions GmbH 4 49 Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. regulation under public law and e-mail threads like viruses or Phishing attacks. The process works similar for outgoing e-mails. Note: See also the Proxmox Mail Gateway Administration Guide for a detailed product description.com 1 Introduction The huge amount of e-mail traffic is a challenge for every e-mail environment. or it could cause a public-relations problem that no organization would want. © 21. The daily e-mail routine brings along some major problems. If the email server is not working. and professionally managed e-mail improves organizational workflow and customer satisfaction.com www.proxmox. this includes: performance. E-mail is an essential service for any organization. reliability.2010 Proxmox Server Solutions GmbH 5 49 .05. This document covers samples and deployment information how to integrate and customize Proxmox in your e-mail environment. A missed e-mail could mean a lost opportunity. How does Proxmox work? When an e-mail arrives at the Proxmox Mail Gateway. it is analyzed and forwarded to your e-mail server which is responsible for sending the e-mail to the receiver. Proxmox Mail Gateway temporarily stores the message in the e-mail queue for later transfer. 05. You can manage incoming and outgoing e-mail traffic. For high availability and maximum performance it is recommended to use a Proxmox HA Cluster.com 2 Proxmox Mail Gateway Integration 2.2010 Proxmox Server Solutions GmbH 6 49 . Figure 2-2 Incoming e-mail with Proxmox Mail Gateway © 21.com www. With the integrated Proxmox system all your e-mail traffic is forwarded to the Proxmox Mail Gateway which filters the whole e-mail traffic and removes unwanted e-mails. your e-mail traffic (SMTP) arrives on the firewall and will be forwarded directly to your e-mail server. Proxmox Mail Gateway can process incoming AND outgoing SMTP traffic by using different ports. one port for outgoing e-mails.proxmox. see chapter 5 Proxmox HA Cluster – High availability. One port is assigned to incoming.1 E-mail system without Proxmox In a sample configuration.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. Figure 2-1 System without Proxmox Mail Gateway 2.2 E-mail system with Proxmox A single Proxmox Mail Gateway Server can handle unlimited mail domains with multiple internal mail servers and millions of e-mails per day. Consider two users. Which user do you consider more active? I am sure its user-2. While user-2 receiver 5 mails from a customer and sent 5 mails back. © 21. Proxmox is able to detect viruses sent from an internal host.proxmox. user1 receives 10 mails from news portals and wrote 1 mail to a person you never heard from.2010 Proxmox Server Solutions GmbH 7 49 . 2. Proxmox outgoing e-mail scanning feature is an additional protection to avoid that.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. Opposed to that Proxmox Mail Gateway is designed to scan both incoming and outgoing mails. Proxmox advanced address statistics can show you this important information.05. I many countries you are liable for not sending viruses to other people.com Many mail filter solutions do not scan outgoing mails. Statistics about incoming e-mails looks nice. because he communicates with your customers. This has two major advantages: Figure 2-3 Outgoing with Proxmox Mail Gateway 1. Proxmox can gather statistics about outgoing e-mails too. but they are quite useless.com www. Solution which does not scan outgoing mail can’t do that. 3.g. Figure 2-4 Incoming default port settings (port 25) Outgoing Mails: Configure your mail server to send all e-mails to the Proxmox Mail Gateway.proxmox. So that you’re external IP and port 25 shows to the Proxmox Mail Gateway IP and port 26.com 2. for MS Exchange) Sometimes it is not possible to change the outgoing port due to third party software limitations or existing network configurations (e.g. Proxmox sends the e-mails to Internet.1 Default port settings The default configuration of the Proxmox Mail Gateway uses port 25 for incoming and port 26 for outgoing e-mails.2 Alternative port settings (e. Note: Proxmox receives the outgoing e-mails on port 26. changing MS Exchange to another sending port will have impact on Exchange internals and it’s not recommend) To receive e-mails you have to do port forwarding at your Firewall.05.3 Proxmox in the Intranet 2.2010 Proxmox Server Solutions GmbH 8 49 .Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. © 21. port 26.com www. After processing. using standard port 25. Figure 2-5 Outgoing default port settings (port 26) 2. so Proxmox knows its internal trusted e-mail.3. com Figure 2-6 Incoming alternative port settings (port 26) With MS Exchange you should not use port 26 for outgoing so you have to switch these two values (25 and 26). Figure 2-7 Outgoing alternative port settings (port 25) © 21.proxmox.com www.05.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] Proxmox Server Solutions GmbH 9 49 . In the end you have to use port 25 for outgoing and port 26 for incoming mails. 0 255.2 192.1 Net mask 255.168.255.1 10.05.255.proxmox.0. for example: Interface eth0 eth1 eth2 Zone Local Internet DMZ IP Address 192.com www.16.4 Proxmox in DMZ (demilitarized zone) To run a DMZ Zone you have to adjust your Firewall settings.255.1.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] Proxmox Server Solutions GmbH 10 49 .255.168.0 255.0.0 Figure 2-8 Proxmox in DMZ © 21.255.255. The intranet (Local) and DMZ needs to have different IP Networks.com 2. com 2.2010 Proxmox Server Solutions GmbH 11 49 .com to your first e-mail server.5 Proxmox with multiple e-mail server and mail domains You can use Proxmox Mail Gateway sending e-mails to different internal e-mail servers. SMTP ports and mail domains of your additional e-mail servers. otherwise it will not work! © 21.com to a second one. Figure 2-9 Multiple e-mail servers Note: you need for each domain an appropriate license.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. For example you can send e-mails addressed to domain.05.proxmox. and e-mails addressed to subdomain.domain. In the e-mail proxy transport section add the IP addresses or hostname.com www. proxmox.09 ms FSYNCS/SECOND: 1084. Here is a sample output of “proxperf”: proxmox:~# proxperf CPU BOGOMIPS: 8489.2010 Proxmox Server Solutions GmbH 12 49 .com www.com 3 Performance Tuning 3. you can never benefit of blocking spam messages on SMTP level. If you get lower results please analyze your hardware and DNS setup – for comments email your results to
[email protected] REGEX/SECOND: 410814 HD SIZE: 6. or if you want to reduce the load on those servers. 3.2 Backup MX Using your ISPs mail server is not a good idea.51 DNS EXT: 46.com) DNSBL: 35. because many ISPs do not use advanced spam prevention techniques.05.spamhaus. Additionally.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. It is recommended to enable it if you do not have access to fast (internal) DNS servers.05 ms (domain.1 Hardware benchmarks Please use the command line tool “proxperf” to get an overview about your hardware and DNS performance.38 MB/sec AVERAGE SEEK TIME: 8. it is recommended to run a second Proxmox server in HA Cluster mode to avoid lower spam detection rates 3. And spammers know this and they use your ISP backup MX to work around your Proxmox spam filtering.3 Local DNS cache Proxmox includes a local DNS cache. Note: Never run “proxperf” if the system is under load.47 ms (zen.org) proxmox:~# Please compare your results against this reference.com.89 GB (/dev/sda2) BUFFERED READS: 116. If you need redundancy. Figure 3-1 Use local DNS Cache © 21.26 ms DNS INT: 1. com 3. If you want to exclude some senders or receivers from getting blocked on the SMTP level. depends on your environment. Greylisted e-mails never reach your mail server and your mail server will stop sending useless "Non Delivery Reports" to spammers. it is greylisted for a period of time (how much time is dependent on the server configuration). he will never be greylisted. if the triplet has never been seen before. just enter in the Mail proxy whitelist.2010 Proxmox Server Solutions GmbH 13 49 . Greylisting is effective because many mass e-mail tools utilized by spammers are not set up to handle temporary failures (or any failures for that matter) so the Spam is never received.com www. If a sender has a valid SPF record. a server that utilizes Greylisting will record the following three pieces of information (referred to as triplet) for all incoming e-mail.4 Blocking Emails on SMTP level Blocking emails before they reach your network saves your internet bandwidth and reduces processing power. a legitimate server will attempt to connect again later on to deliver the e-mail.1 Greylisting Typically. The e-mail is rejected with a temporary error. © 21.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. This feature can reduce e-mail traffic up to 50%.proxmox.4. filling up the queue. you can reduce your email traffic by more than 90 %. The assumption is that since temporary failures are built into the RFC specifications for e-mail delivery. Figure 3-2 Mail proxy whitelist 3. Then. By doing the following. The IP address of the connecting host The envelope sender address The envelope recipient address The client is checked against the mail server's internal whitelists (if any) first.05. e-mail. Proxmox use the following RBL providers by default: • Spamhaus. etc. All domains already publish e-mail (MX) records to tell the world what machines receive e-mail for the domain. 3. SPF works by domains publishing "reverse MX" records to tell the world what machines send email for the domain.com www. When receiving a message from a domain.4. Therefore Proxmox has to query the RBL server for every SMTP connection.com 3.org • dsbl.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected].) to the machines that perform those services.org Figure 3-3 Enable RBL checks © 21.org for setting up a SPF for your mail domain. Please make sure.proxmox. that you deploy a valid SPF record for your mail domain.3 Real time Blacklists (RBL) Proxmox can use RBL checks on SMTP level to reject e-mails.05.2010 Proxmox Server Solutions GmbH 14 49 . Note: see http://www.4. the recipient can check those records to make sure e-mail is coming from where it should be coming from.2 Sender Policy Framework – SPF Domains use public records (DNS) to direct requests for different services (web. 1 Configuring local DNS blacklist caches Some DNS blacklist providers offers data feed services.org:ip4set:sbl \ pbl.41” stands for the minutes of each hour.org -mailto root Note: “11. Please log in to the console and configure the following: crontab –e 11.proxmox.spamhaus.1' to disable it (default). or '127. For details visit http://www. usually started via cron.spamhaus.org:ip4trie:pbl \ zen.0. please replace these values with the one in your spamhaus datafeed license.org:ip4tset:xbl \ list. Proxmox can use local DNS blacklist caches of spamhaus. Just set the IP address of your local mirror.spamhaus.0. 3.0.spamhaus.org and dsbl. If these servers are under heavy it cannot be guaranteed that you will get an answer – also if you are running a high traffic site it is recommended to locally cache both RBL´s.com www.4 Local DNS RBL cache – Spamhaus Datafeed Service Each e-mail leads to a DNS query to the RBL server of spamhaus and dsbl.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected]. but you can also use any other server within your network. Proxmox can synchronize these blacklists locally to provide quality of service and speed up the query time.4.-r/var/lib/rbldns -f -b127.0. You can locally mirror blacklist data making queries to remote DNS servers unnecessary.com 3.org --dsbl rsync.org.2010 Proxmox Server Solutions GmbH 15 49 .dsbl.4.2 \ sbl.spamhaus. Next.org:ip4tset:xbl \ zen.com HowTo: Synchronize DNS blacklist to the Proxmox server Local sync is done via proxblsync.dsbl.spamhaus. Note: Spamhaus data feed is a commercial service – additional license/account required.org:ip4set:sbl \ zen.org:ip4trie:pbl \ xbl. You can use your Proxmox Server to download the blacklists.4. configure the RBLDNS daemon configuration file: nano /etc/default/rbldnsd RBLDNSD=".org:ip4set:dsbl" © 21.05.spamhaus.41 * * * * proxblsync --spamhaus rsync1. this means for your systems: reduced traffic. This could be up to 95 % of junk messages. which means BEFORE the e-mails are transferred to your networks.com www.2010 Proxmox Server Solutions GmbH 16 49 .05.org and Dsbl.org 3. e-mail domains are receiving a lot of e-mails to non-existing users. 90 % less e-mails to analyze for spam and viruses Good performance and costs © 21.proxmox.5.4. this means for your systems: Increased traffic on your internet connection Your e-mail server is handling junk e-mails instead of working for you High load on your scanners Slow overall performance and high costs 3.1 Proxmox Solutions Proxmox can detect these e-mails to non-existing users on SMTP level.com Start the RBLDNS service: /etc/init. In short. In short.5 Receiver Verification Nowadays.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected]. redirect query to local mirror: Figure 3-4 Enable local RLB cache – Spamhaus.d/rbldnsd start Finally. up to 90 % Your internal e-mail server is now working for you again Reduced load on your scanners. 1 Settings for Exchange 2003 SP2 Figure 3-5 Enable Verify Receivers © 21. 450 means. Note: Your internal e-mail server has to be reconfigured to reject unknown user.2.proxmox.com 3. For settings on Exchange 2003 SP2.4.5.5.2 Enabling Verify Receivers You can enable this option on the admin interface (Configuration/Mail Proxy/Options) We recommend selecting yes (450).2010 Proxmox Server Solutions GmbH 17 49 .4. Proxmox is doing a short query to the internal e-mail server to check if the user is valid. that in the case of a short downtime of your internal mail server no messages are lost.com www.05.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. see chapter 3. Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. please use the Exchange System Manager.5.05. Figure 3-6 Exchange 2003: Filter recipients 1 © 21.2010 Proxmox Server Solutions GmbH 18 49 .1 Settings for Exchange 2003 SP2 You have to enable Recipient Filtering.com www.2.4.com 3.proxmox. com www.proxmox.2010 Proxmox Server Solutions GmbH 19 49 .com Figure 3-7 Exchange 2003: Filter recipients 2 © 21.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected]. com www.2010 Proxmox Server Solutions GmbH 20 49 .com Figure 3-8 Exchange 2003: Filter recipients 3 Figure 3-9 Exchange 2003: Filter recipients 4 © 21.proxmox.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected]. com 3. Figure 3-11 Exchange 2007 SP1: Filter recipients 1 © 21. 3. Microsoft provides an install script to manually install the Anti-Spam agent: 1.4.05.com www. this is NOT installed by default. 2.2 Settings for Exchange 2007 SP1 First. If you installed a typical one server installation.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] Proxmox Server Solutions GmbH 21 49 .2.\install-AntispamAgents Restart the Microsoft Exchange Transport service Figure 3-10 Exchange 2007 SP1: Install Anti-Spam agent Now you can enable Recipient Filtering on the Anti-Spam agent. make sure that you have the Exchange 2007 Anti-Spam agent. please use the Exchange Management Console.5. Open the Exchange Management Shell cd “c:\program files\Microsoft\Exchange Server\Scripts” . 4. TO.object Example: Does the e-mail contain spam? Action .object For TO and/or FROM Category Example: Mail object .Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] www. It’s an easy but very powerful way to define filter rules by user. For example enable Archive Solutions with BCC Object (Blind carbon copy. WHEN. time frame. recipients not visible in the "To" field) to Mailbox or to a Public Folder FROM: Anybody TO: Anybody WHEN: Always WHAT: Mail ACTION: BCC to Publicfolder In most of the countries worldwide a company has to forward all e-mails to there employees this includes spam e-mails as well. content type and resulting action.2010 Proxmox Server Solutions GmbH 22 49 . Every rule has got 5 categories (FROM. Who . domains. ACTION) which can contain several objects.Who is the sender or receiver of the e-mail? When .object Example: Mark e-mail with "SPAM:" in the subject. © 21.com Figure 3-12 Exchange 2007 SP1: Filter recipients 2 4 Rule System The object-oriented rule system enables custom rules for your domains.proxmox. WHAT.object Example: When is the e-mail received by Proxmox Mail Gateway? What .05. spammers can send hundreds of millions of e-mail messages each day over an inexpensive internet connection.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. Because of the very low cost of sending email. It’s compatible to every type of mail server or MTA (e. To increase the efficiency of e-mail communications the use of anti-spam. With the deployment of Proxmox Mail Gateway you get the job done. Quarantine can be enabled just for existing LDAP groups or via BCC to Public Folders or Mailboxes. For example a virus protection looks like this: FROM: Anybody TO: Anybody WHEN: Always WHAT: Virus ACTION: Block Options range from simple spam and virus filter setups to sophisticated. which reduces the usefulness of e-mail as a practical tool.com www. Postfix …). Lotus Domino. E-mail worms use e-mail as a way of replicating themselves into vulnerable computers. anti-pishing and antivirus software is essential. Microsoft Exchange. At present the usefulness of e-mail is being threatened by three phenomena: spamming. © 21. Spamming is unsolicited commercial e-mail.proxmox. The combination of spam and worm programs results in users receiving a constant drizzle of junk e-mail. It can be easy integrated in existing E-mail architecture.2010 Proxmox Server Solutions GmbH 23 49 . Based on the design as software appliance one of the strengths of Proxmox Mail Gateway is its flexibility.g. pishing and e-mail worms.com For example to send Spam mails in quarantine FROM: Anybody TO: Anybody WHEN: Always WHAT: Spam ACTION: Quarantine With this kind of setup the receiver gets detailed Information about the Spam e-mails.05. Hundreds of active spammers sending this volume of mail results in information overload for many computer users who receive tens or even hundreds of junk messages each day. highly customized configurations blocking certain types of e-mails and generating notifications. 1 Default Rules 4. Figure 4-2 Rule: Virus Alert © 21.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] 4.2 Virus Alert This rule blocks all outgoing virus e-mail and informs the admin and sender via e-mail notification.proxmox.05. Figure 4-1 Rule: Block Viruses 4.2010 Proxmox Server Solutions GmbH 24 49 .1 Block Viruses This rule blocks all incoming virus e-mail and informs the admin via e-mail notification.com www. 1.com 4.3 Block Dangerous Files This rule removes dangerous attachments from incoming e-mails (..bat.2010 Proxmox Server Solutions GmbH 25 49 . Figure 4-4 Rule: Mark Spam © 21. …) Figure 4-3 Rule: Block Dangerous Files 4.vbs.05..proxmox.4 Mark Spam This rule identifies spam and modifies the spam level and the e-mail subject.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] www.1.com. 2 Custom Rules Proxmox provides samples for custom rules to show the functionality.com www.1 Enable Spam and Virus quarantine Activate or change the Spam and/or Virus rule with the existing action object “Quarantine”.proxmox.proxmox.2 Enable Spam quarantine for just a selection of users If you want to use the spam quarantine for specific users or a specific domain (and for the rest just “Mark Spam”). Activate the rule © 21. Figure 4-5 Add “Quarantine” action to rule “Mark Spam” 4. give a name like “Quarantine Users” and add the users or domains to this object 2. For support or help configuring rules see the Proxmox support forum at: http://www. Use the existing (inactive) rule “Spam Quarantine” and set higher priority than the “Mark Spam” rule (e. 81) 3. Add the WHO object “Quarantine Users” 4.g.05. create a new WHO object containing these users or domains.2.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. Create a new WHO object.com/forum/ or contact a Proxmox partner.2.com 4. 4. 1.2010 Proxmox Server Solutions GmbH 26 49 . Create a new WHO object.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] Figure 4-6 Enable Spam quarantine for just a selection of users 4. 1.2010 Proxmox Server Solutions GmbH 27 49 .2. you can use the LDAP query “Existing LDAP”.proxmox. give a name like “Existing LDAP address” and add the LDAP group “Existing LDAP address” 2.05. Activate the rule Figure 4-7 Create WHO object “Existing LDAP address” © 21.3 Enable Spam quarantine for existing LDAP users If you want to use the spam quarantine only for existing internal e-mail addresses. 81) 3. Use the existing (inactive) rule “Spam Quarantine” and set higher priority than the “Mark Spam” rule (e.com www.g. Add the WHO object “Existing LDAP address” 4. com www.proxmox.05.com Figure 4-8 Enable Spam quarantine for existing LDAP addresses © 21.2010 Proxmox Server Solutions GmbH 28 49 .Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. 2010 Proxmox Server Solutions GmbH 29 49 .g. you can block Spam with a score higher 10 to reduce the delivery of spam e-mails to the user.2. 2.4 Block Spam e-mails with a score higher 10 The default setting marks Spam with a score higher 5 and delivers the e-mail to the user. give a name. Create a new “What Object”. “Spam Level 10” Figure 4-9 Add “Spam Filter” to the Object Figure 4-10 Set the Set Spam Filter to Level 10 Figure 4-11 Add new Rule.com 4. With this additional rule.com www.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected]. 8. 7.proxmox. e. 4. Set Priority to 81 (higher than the “Mark Spam” rule!. 5. 6. “Delete Spamlevel 10”.05. 1. 3. e. give a name. set Direction to “In” Figure 4-12 Add What Object “Spam Level 10” to the rule Figure 4-13 Add Action Object “Block” to the rule Figure 4-14 Final review (still inactive) Figure 4-15 Activate rule Figure 4-16 Figure 4-9 Add new What Object © 21. proxmox.com Figure 4-10 Add Spam Filter to a What Object Figure 4-11 Set Spam Filter to Level 10 © 21.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] www.2010 Proxmox Server Solutions GmbH 30 49 .05. com www.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] Figure 4-12 Add new Rule Figure 4-13 Add What Object to a Rule © 21.05.2010 Proxmox Server Solutions GmbH 31 49 . 05.com www.2010 Proxmox Server Solutions GmbH 32 49 .proxmox.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] Figure 4-14 Add Action Object to a Rule Figure 4-15 Final Review of Rule (still inactive) © 21. Exchange creates the e-mail address 4. Create an Action Object: “Add BCC Object”. remember e-mail address 5. Add Action Object “BCC to Archive Public folder or Mailbox” to the rule How to create a Mail Enable Public Folder under Exchange 2000/2003? 1.6 Block Video and Audio Attachments 1. you can also send a copy to a mail enabled public folder. Create a public folder in Exchange (Exchange System Manager or via Outlook) 2. If you have Microsoft Exchange. Set appropriate client permission (note: anonymous must have the right to create items) 6. Right click the folder an check the e-mail address (or change it. 1.05.proxmox.2. name it “BCC to Archive Public folder or Mailbox” 2. "Mail enable" the public folder via Exchange system manager – right click an select “Mail Enable” 3. define direction and set priority 2. Wait a few minutes. Add What Object “Multimedia” to the rule © 21.g.com Figure 4-16 Activate Rule 4. Under “Receiver”. Create a new rule.5 BCC object – An simple archive solution If you need to archive e-mails it’s useful to send a copy to a special mailbox.2010 Proxmox Server Solutions GmbH 33 49 .2. e.com www.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. Click on an already existing rule or create a new one 4. if you want). “Block Multimedia Files”. type the e-mail address of the public folder/Mailbox 3. Optional: Set age limit: select “Limits” and set the age limit to 90 days (all messages older than 90 days will be automatically deleted) 4. Add the ACTION object “block” (for testing. Add the WHAT “Spam” to the rule 7. 3. Final review (still inactive) 9.7 Add Admin Notification to Rules If you block mails it’s useful to inform the Proxmox Admin. Activate the rule 4.g. Add Action Object “Block” to the rule 4. then click save. Create a new “WHO Object”. Add an “LDAP Group” to the Object. Add the “notify Admin” action to the rule 4.8 Preventing directory harvesting attacks with LDAP object The LDAP group object “Unknown LDAP address” can be used to prevent directory harvesting attacks. If you type an unknown e-mail address. Add the WHO object “Unknown LDAP” from above to the rule (as “to”) 6.proxmox.g. it should be member of the Unknown LDAP group. set priority to 85 (higher than the “Mark Spam” rule. Click on the desired rule 2. 1. “Unknown LDAP”. If you type a valid e-mail address. Add new rule. e.2. “Unknown LDAP” 2. Now you can test your object against e-mail addresses. give a name.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. 4. The Mail Gateway can check incoming e-mail addresses against valid e-mail addresses in your organization.2. Final review (still inactive) 5.com 3. So you just block attacks from spammers and you still are able to send NDR to people just mistyping an e-mail address. e. it should not be member. 1. Activate the rule Note: Add always the “Spam” object – because most directory attacks are also spam. give a name.com www.05. select “Any profile” and “Unknown LDAP Address”.2010 Proxmox Server Solutions GmbH 34 49 . set direction to “in” 5. © 21. just add a notify to see results – be careful with block action) 8. Most people like sending joke videos and audio files via e-mail – this grows up your users mailboxes. set direction to “in”. e. select “your LDAP Profile” and select “Staff” from the dropdown menu.com Figure 4-17 Unknown LDAP address rule 4. Create a new “WHO Object”.05. On the other side.2010 Proxmox Server Solutions GmbH 35 49 . click save Add the WHO object “Staff” from above to the rule (as “to”) Add the WHAT “Multimedia” to the rule Add the ACTION object “Remove Attachments” Final review (still inactive) Activate the rule Note: Removed attachments from e-mails are replaced with a text file. give a name.9 Block Video and Audio Attachments for LDAP Groups The LDAP groups can be used to apply special settings to groups.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. Now you can test your object against e-mail addresses Add new rule. “Block Multimedia for Staff”.g.com www.g. you do not want to block these funny things for everybody. give a name. set priority to 70.proxmox. © 21. e. click save. “Staff” Add “LDAP Group” to the Object. We assume you have a LDAP group called “Staff”.2. com Figure 4-18 Block video and Audio attachment for LDAP group “Staff” © 21.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] www.proxmox.05.2010 Proxmox Server Solutions GmbH 36 49 . Configuration and data is synchronized to all cluster nodes over a VPN tunnel. and nodes automatically reintegrate after temporary failures without any operator interaction. Figure 5-1 Proxmox HA Cluster with load balanced MX records © 21. Complete Cluster setup is done within minutes. The Proxmox HA Cluster consists of a master and several nodes (minimum one node). This provides the following advantages: centralized configuration management fully redundant data storage high availability high performance Proxmox uses a unique application level clustering scheme. To meet these requirements we developed the Proxmox HA (High Availability) Cluster. which provides extremely good performance.com 5 Proxmox HA Cluster – High availability We are living in a world where e-mail becomes more and more important .Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] in email systems are just not acceptable.05. Special considerations where taken to make management as easy as possible.2010 Proxmox Server Solutions GmbH 37 49 .proxmox.com www. Configuration is done on the master. com www.e.com). Figure 5-2 Load balancing via MX Records © 21.com 5. i.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. Many e-mail systems nowadays reject mails from hosts without valid PTR records.05. You have to define two MX records with the same priority. each having its own IP address (the rest of the setting should be more or less equal.proxmox.2010 Proxmox Server Solutions GmbH 38 49 .com and mail2. You will receive mails on both hosts.example. more or less load-balanced (round-robin scheduling). you can use backup/restore to copy the rules).example. This is all you need. We recommend adding reverse lookup entries (PTR records) for those hosts. If one host fails the other is used. You need to have 2 working Proxmox Mail Gateways (mail1.1 Load Balancing with MX Records It’s quite simple to set up a high performance load balanced mail cluster using MX records. 2 Multiple Address Records Using several DNS MX record is sometime clumsy if you have many domains.com 5.com www.3 Using third party Firewall features Many firewalls can do some kind of RR-Scheduling (round-robin) when using DNAT. but multiple address records: Figure 5-3 Load balancing Multiple Address Records 5.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] Proxmox Server Solutions GmbH 39 49 . See your firewall manual for more details. © 21.05. It is also possible to use one MX record per domain.proxmox. proxmox. © 21.2 Proxmox VE (http://pve.com www. For maximum performance we recommend: Hard disks CPU RAM SAS Disk (15.1 Physical Hardware See http://www.proxmox.3 and later supports VMware™ para-virtualization (Kernel 2. 6.com/wiki/Proxmox_Mail_Gateway 6.6. 6.com for certified hardware. For quick deployment Proxmox delivers a ready to run. Proxmox can be run under VMware™.000rpm).27) and we deliver a prebuilt VMware Tools package for installation (already included in the Appliance).com.05.1.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. preconfigured and certified Virtual Appliance. Alternative.proxmox. Installation from the ISO-Image is also fully supported and gives the possibility for custom settings. Hardware Raid with battery backup and cache enabled Two Quad Core Xeon (5xxx) 4 GB ECC 6.com 6 Hardware selection and Virtualization Proxmox always needs a dedicated PC or server hardware. Proxmox delivers prebuilt Virtual Appliances for: Proxmox VE (http://pve.1 Certified Hardware The latest certified hardware list is published on http://www. optimized for the VMware™ Host. OpenVZ and Proxmox VE.proxmox. Proxmox 2.proxmox.3 VMware™ Proxmox runs perfectly under VMware™.proxmox.com) VMware™ OpenVZ Also known to work (Intel VT or AMD-V needed): Virtualbox XEN (Full virtualized) Citrix XenServer (Full virtualized) Parallels Server Virtualbox Hyper-V For best performance please use physical hardware or OS virtualization like Proxmox VE (OpenVZ).com) The Mail Gateway is available as a certified Virtual Appliance for Proxmox VE.2010 Proxmox Server Solutions GmbH 40 49 . For all details see http://pve. 3.1.com/forum/.1.1. 6.3.com. 6.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected]. This leads to very poor performance. 6.1. A VMware™ host can swap memory between guests and if configured. While memory overcommit is possible.3 Enable VMI Paravirtualization Figure 6-1 Enable VMI Paravirtualization for Proxmox Mail Gateway on ESX © 21.proxmox.proxmox. ESXi and vSphere Proxmox dynamically adapts the number of processes referring to the given memory to maximize performance. the host can show more physical memory to the guest as available by swapping to disks. if Proxmox runs on a machine with 1 GB memory it uses 1 GB of memory. for optimal operation you should never assign more memory to virtual machines than is available on the host.3.2010 Proxmox Server Solutions GmbH 41 49 . For more details see VMware documentation on http://www. Please visit the support forum for detailed instructions and downloads. This means.2 VMware Tools Proxmox precompiles the VMware Tools components for easy installation.1 Settings for the Proxmox Mail Gateway Virtual Machine 6.vmware.1 Settings for VMware™ ESX.com www.3.com 6.1 RAM settings The minimum memory for running Proxmox Mail Gateway is 512 MB RAM.3.1.05.1. http://www. 6.com.com www. if Proxmox runs on a machine with 1 GB memory it uses 1 GB of memory.3. This means. they have the best possible performance.05. Because the virtual machines are running entirely in RAM. This setting imposes the tightest restrictions on the number and memory size of virtual machines that can run at a given time.4 Enable time synchronization Figure 6-2 Enable time synchronization on ESX/ESXi 6. While memory overcommit is possible.com 6. For more details see VMware documentation on http://www.3.1. This leads to very poor performance.3.proxmox.vmware.1. for optimal operation you should never assign more memory to virtual machines than is available on the host. the host can show more physical memory to the guest as available by swapping to disks. A VMware™ host can swap memory between guests and if configured.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox. © 21.2.1 Host memory settings Always choose this option: “Fit all virtual machine memory into reserved host RAM” Strictly apply the reserved memory limit set in the top of the panel.2 Settings for a VMware™ Server 2 Proxmox dynamically adapts the number of processes referring to the given memory to maximize performance.2010 Proxmox Server Solutions GmbH 42 49 . 3.2.2.3.1 RAM settings The minimum memory for running Proxmox Mail Gateway is 512 MB RAM.2.proxmox.3.2.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] Proxmox Server Solutions GmbH 43 49 .com/forum/.2. Please visit the support forum for detailed instructions and downloads.proxmox. http://www.2 VMware Tools Proxmox precompiles the VMware Tools components for easy installation.com www.2.2 Settings for Proxmox Mail Gateway Virtual Machine 6.3. 6. 6.com Figure 6-3 Memory settings for VMware Server 2 Host 6.3 Enable VMI Paravirtualization © 21.05. 2010 Proxmox Server Solutions GmbH 44 49 .Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] Figure 6-4 Enable VMI Paravirtualization for Proxmox Mail Gateway 6.com www.2.4 Enable time synchronization © 21.2.05.proxmox. we launched a wiki page on: © 21. please visit http://openvz. OpenVZ supports online migration from a running Proxmox from one hardware node to another without downtime. For running Proxmox on OpenVZ. built on Linux.com www.4 OpenVZ OpenVZ is an Open Source Operating System-level server virtualization solution. For details about OpenVZ. Main advantage from Operating System-level server virtualization is minimum overhead which leads to maximum performance. OpenVZ is also used in Proxmox VE (http://pve.com Figure 6-5 Enable time synchronization on VMware Server 2 Host 6. Proxmox runs on OpenVZ quite as fast as on physical hardware with all advantages from virtualization.proxmox.com).Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected]/.proxmox.05.2010 Proxmox Server Solutions GmbH 45 49 . org/Backup_of_a_running_VE_with_vzdump © 21.2010 Proxmox Server Solutions GmbH 46 49 .proxmox.com www. we developed vzdump: http://wiki.com http://wiki.05.openvz.openvz.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected]/Proxmox_Mail_Gateway_in_VE For online backups of a running OpenVZ. Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] Proxmox Server Solutions GmbH 47 49 .05. All information: http://www.com Email support:
[email protected] © 21.com www.com 7 Troubleshooting and technical support Use the moderated Proxmox support forum or contact a Proxmox partner for their support offerings. ....................................................................35 4-18 Block video and Audio attachment for LDAP group “Staff” .........................................................................................................33 4-17 Unknown LDAP address rule....org .....45 © 21.................................31 4-14 Add Action Object to a Rule ....................................32 4-16 Activate Rule ..............................................................................................................................44 6-5 Enable time synchronization on VMware Server 2 Host ......................Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna office@proxmox...................................................org and Dsbl....................... 9 2-7 Outgoing alternative port settings (port 25) ........................................2010 Proxmox Server Solutions GmbH 48 49 ..................................... 6 2-2 Incoming e-mail with Proxmox Mail Gateway.37 5-2 Load balancing via MX Records................................10 2-9 Multiple e-mail servers ....................................................22 4-1 Rule: Block Viruses ..........................................proxmox......com 8 Table of figures Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure 2-1 System without Proxmox Mail Gateway ..........................................19 3-8 Exchange 2003: Filter recipients 3 ...com www.....27 4-7 Create WHO object “Existing LDAP address” ..........................................................28 4-9 Add new What Object ....................................25 4-4 Rule: Mark Spam .20 3-10 Exchange 2007 SP1: Install Anti-Spam agent ..........29 4-10 Add Spam Filter to a What Object ...................11 3-1 Use local DNS Cache ..................................................... 8 2-6 Incoming alternative port settings (port 26) .........................................12 3-2 Mail proxy whitelist .24 4-2 Rule: Virus Alert ..................26 4-6 Enable Spam quarantine for just a selection of users .38 5-3 Load balancing Multiple Address Records ..............................................................................................................................17 3-6 Exchange 2003: Filter recipients 1 ..........................................................................................20 3-9 Exchange 2003: Filter recipients 4 ................21 3-12 Exchange 2007 SP1: Filter recipients 2............13 3-3 Enable RBL checks .18 3-7 Exchange 2003: Filter recipients 2 .........14 3-4 Enable local RLB cache – Spamhaus...............................................................................................32 4-15 Final Review of Rule (still inactive) ......... 8 2-5 Outgoing default port settings (port 26) ......................................31 4-13 Add What Object to a Rule .................41 6-2 Enable time synchronization on ESX/ESXi .......................... 6 2-3 Outgoing with Proxmox Mail Gateway .......................................27 4-8 Enable Spam quarantine for existing LDAP addresses ............................................................................................................................................................................................16 3-5 Enable Verify Receivers ...........................................................................................................................................................................................................................39 6-1 Enable VMI Paravirtualization for Proxmox Mail Gateway on ESX ...................................................................30 4-12 Add new Rule ......43 6-4 Enable VMI Paravirtualization for Proxmox Mail Gateway ......................................................................................................25 4-5 Add “Quarantine” action to rule “Mark Spam” .21 3-11 Exchange 2007 SP1: Filter recipients 1....................................30 4-11 Set Spam Filter to Level 10 ...................................24 4-3 Rule: Block Dangerous Files . 9 2-8 Proxmox in DMZ .................................05............................................36 5-1 Proxmox HA Cluster with load balanced MX records ......................................................................... 7 2-4 Incoming default port settings (port 25) ...42 6-3 Memory settings for VMware Server 2 Host ............. com www.End of document - © 21.com 9 Appendix Reference document: Mail Gateway AdminGuide You can download the latest version from www.proxmox.Proxmox Server Solutions GmbH Kohlgasse 51/10 A-1050 Vienna
[email protected] Proxmox Server Solutions GmbH 49 49 .com .05.proxmox.