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PixelPaul
Asked: 2015-06-04 23:30:16 +0800 CST

possible for all outbound smtp to run through proxy?

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Is it possible to setup my centos 6.5 so all outgoing port 25 is run through a proxy. I have incoming smtp/port 25 coming to my mail server through HAproxy but i would like the outgoing to do the same so the receiving mail server sees the connection coming from my load balancer IP. i have been searching the net for last hour but can't find any examples or setups.

centos

1 Answers

  1. While it might be possible, make sure your mail server identifies itself using the name assigned to your haproxy server.

    By design SMTP is resilient to network and server failures. I can't see a good use case for putting an email server behind haproxy. It might make sense to put and IMAP or POP server behind haproxy.

    If you have a single email server, then you can do what you wish much simpler with iptables rules. If you have multiple email servers, each should have a unique IP address. These addresses should have DNS entries that pass rDNS for the domain name they identify themselves as. The mail servers can (usually) use a domain name different from that of the host they run on.

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