Relayhost depending on sender

Webmin
1

Still learning a lot of Linux ropes. I send ALL mail out to Spamtitan to protect my email server.
I know I can use the default relayhost (direct) and map other domains or mailboxes to use a relayhost.
But is it possible to do the reverse?
For example I want to use Spamtitan as the default relayhost but occasionally make one emailbox go direct (to temporarily get round SpamTitan delivery rates for instance).
Of course if I map one mailbox to the localhost it results in a loop.
May well be a limitation of Postfix itself, but if I am missing something, I’d appreciate a steer.
Cheers
john

SYSTEM INFORMATION
OS type and version Linux 5.14.0-427.31.1.el9_4.x86_64 on x86_64
Webmin version 2.202
2

Postfix has very few limitations. Look up sender dependent relay host setting of Postfix.

Configuring this will let you do what you have described.

1 Like
3

Thanks for the reply Calport. I have tried (using Sender Dependent Transport Mapping), but the problem is that when I add the entry to send directly, I get a loop back.
For domain xxx.com, I use the syntax "@xxx.com smtp:[xx.xx.xx.xx] )IP address of localhost.
I can use direct delivery as default and map to the SpamTitan server on a per domain basis - but not the otherway round :frowning_face:

4

Note if this help, the docs say use the IP of Virtual server’s address but it my also work on a external IP address.

5

Thanks Stefan,
But no, use of the virtual server address loops back on itself if the default is to use an external relay host.
I think I have resigned myself to the fact that mapping only works if the default is to send mail direct (no relay host)

6

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