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)?
Best Answer
It seems that this is possible using the
sender_dependent_default_transport_mapsoption. Have a look at this page and this.