Posts Tagged ‘mail server’
April 1st, 2009 | 
Author: This post will explain how to configure a backup MX server for queuing mail for two (or more) domains if the primary mail server of those domains become unreachable.
I’ve tested this configuration for relaying mail to Microsoft Exchange, Postfix, QMail, Sendmail, Lotus Domino, Merak and other less common mail server without any kind of problems.
You could use Red Hat Enterprise Linux (RHEL) or CentOS without change an line of the following configuration, but with small adjustement you can use this how to to any linux distribution.
I’ve used Postfix as mail server, because for me it’s the best, and Amavisd-New, Clamd and SpamAssassin for checking Virus and Spam on relaying mail.
This post assume you have two queuing for two domains “yourdomain.com” and “yourdomain.net”.
This post assume that you have a primary mail server (MX with preference 10) for “yourdomain.com” with IP 111.111.111.111 and a primary mail server (MX with preference 10) for “yourdomain.com” with IP 111.222.222.222 and you want to use a server with IP 222.222.222.222 for queuing mail of both domains.
This post will explain how to configure a relay server to put on a DMZ network for relay mail for two domains, and use two mail server on the internal network.
This configuration will be useful to not publish your SMTP server (Linux, Exchange, Lotus Domino or whatever you have) directly on internet, and keep it in your internal network, and publish a relay server for security purpose.
I’ve tested this configuration for relaying mail to Microsoft Exchange, Postfix, QMail, Sendmail, Lotus Domino, Merak and other less common mail server without any kind of problems.
You could use Red Hat Enterprise Linux (RHEL) or CentOS without change an line of the following configuration, but with small adjustement you can use this how to to any linux distribution.
I’ve used Postfix as mail server, because for me it’s the best, and Amavisd-New, Clamd and SpamAssassin for checking Virus and Spam on relaying mail.
This post assume you have two internal network 192.168.1.0/24 and 192.168.2.0/24 and you have a mail server for yourdomain.com on the 192.168.1 network and another mail server for yourdomain.net on 192.168.2 network.
In particular the yourdomain.com mail server have 192.168.1.4/24 and yourdomain.net mail server have 192.168.2.1/24.
This post will also explain how to configure a simple SMTP authentication based on sasl to authenticate external user directly on the relay server and permit them to send mail to any ther domain using it.
