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I'd like to setup 2 distinct mail services (that look completely separated for end-user) on one machine with 2 IP addresses and 2 domain names. I've started with my current config which is a postfix+dovecot with virtual domains/users using MySQL (it was setup some time ago with an online guide). I've added

localhost:smtp      inet  n       -       -       -       -       smtpd
<ip1 here>:smtp      inet    n       -       -       -       -       smtpd
<ip2 here>:smtp      inet    n       -       -       -       -       smtpd -o myhostname=domain2.com

so when I connect to smtp using another domain name, it has its own banner, but...

Outgoing messages are still delivered with ip address #1 which is rDNSed to domain1.com. How can I change my setup so outgoing mails from domain2.com are being delivered using ip2 interface (so email headers say Received from: domain2.com and not domain1.com)?

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2 Answers

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It seems that this is possible using the sender_dependent_default_transport_maps option. Have a look at this page and this.

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It works, but cleanup process doesn't know that there are different myhostnames and all messages have Message-ID header in form of <xxxxxx@domain1.com> even if they're sent from domain2.com. Any ideas how to fix this problem? – Gepard Dec 28 '11 at 21:58
I've fixed it already. The application used own method to send mails via SMTP. I've replaced it with PHPMailer 5.2 and Message-IDs are OK now. – Gepard Dec 29 '11 at 11:15
Nice to hear that! – Khaled Dec 29 '11 at 11:45
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up vote 2 down vote

Maybe multiple Postfix instances is what you're looking for. Reference: http://www.postfix.org/MULTI_INSTANCE_README.html

You can bind two instances to different IP addresses (smtp_bind_address), set different banners (smtpd_banner), etc.

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