Postfix smtp outgoing load balancing

 load balance, postfix  4 Responses »
Oct 032009
 

I got good workaround for balancing smtp outgoing from postfix mailing list archives(not using expensive real load balancer). suppose we have 4 smtp servers for outgoing email, and we need to configure/load balance like this:

                                                         +------------+
                                                         |            |
                    +----------> smtp backend a -------->|            |
                    |                                    |            |
clients --------> smtp lb -----> smtp backend b -------->|  Intenet   |
                    |                                    |            |
                    +----------> smtp backend c -------->|            |
                                                         |            |
                                                         +------------+

Here’s the configuration :

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vmware ESXi 4 + centos 5.3 guest OS + zimbra

 centos, email, smtp  No Responses »
Sep 252009
 

I’ve been playing around with Zimbra opensource edition on my development server. Zimbra is a full-featured, open source collaboration suite for  email, group calendaring, contacts, and web document management and authoring. web interface is equipped with AJAX and it is compatible with clients such as Outlook, Apple Mail, and Novell Evolution so that mail, contacts, and calendar items can be synchronised from these to the ZCS server. It also can be synchronized to many mobile devices. ZCS makes use of many existing open source projects such as Postfix, MySQL, and OpenLDAP.

In this experiment i was using Zimbra 64bit_x86 opensource edition

DNs setting

mail.domain.tld.        A    192.168.1.2
domain.tld.             MX   10    mail.domain.tld.

Download the installer

# wget http://h.yimg.com/lo/downloads/6.0.1_GA/zcs-6.0.1_GA_1816.RHEL5_64.20090911174852.tgz

Extract the installer tarball, make sure we have enough space.

# tar xvzf  6.0.1_GA/zcs-6.0.1_GA_1816.RHEL5_64.20090911174852.tgz
# cd zcs-6.0.1_GA_1816.RHEL5_64.20090911174852

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