What is the correct mail set up for multiple domains on one server?

Posted by newmarc on Server Fault See other posts from Server Fault or by newmarc
Published on 2012-10-30T00:19:54Z Indexed on 2012/10/30 5:05 UTC
Read the original article Hit count: 421

Filed under:

email

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emailserver

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centos5

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reverse-dns

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dkim

I have a machine (centos 5) with one external ip address. On that machine I have many virtual hosts with a few different top level domain names and sub-domains under those eg.

sub1.domain1.com
sub2.domain1.com
sub3.domain1.com
sub1.domain2.com
sub2.domain2.com
sub1.domain3.com

And so on... Alot of these different sites need to send mail as their corresponding domain (or second-level domain at least).

I need to set up DKIM, SPF (but that's handled on the DNS) and rDNS lookup so the mail gets received. As I understand it, you can only have one rDNS entry per machine. I could set up a server for each top level domain, but I'm thinking that'll get expensive.

What should I do here? Is there a way to have multiple rDNS lookups on one ip address? How do I setup DKIM signing for multiple domain names on the one machine? Are there any services out there that could handle this for me?

Thanks for your help...

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