> # /etc/postfix/sender_maps.regexp > /@example\.com$/ [192.168.10.3] > /./ [192.168.10.5 > > - do not index a regexp table with postmap. > - you can use pcre rather than regexp above if your postfix supports pcre > tables.
Ah I misunderstood the precedence, thinking that relayhost in main.cf would be the fallback/catchall. So I tried what you suggested and I believe my problem now might only be regex related? So, in main.cf, I went with pcre since my instance of postfix doesn't support regex: sender_dependent_relayhost_maps = pcre:/etc/postfix/sender_maps.pcre For troubleshooting, I tried setting the "catch all" entry to what I want to relay to (billing.domain2.com) - just to force it so I know this rule is doing something. Doing that works: /@billing\.domain2\.com$/ billing.domain2.com /./ [billing.domain2.com] But when I set it to what I'm trying to do: /@billing\.domain2\.com$/ billing.domain2.com /./ [mail.domain1.com] It seems like it's not matching correctly, though the syntax seems right.
