I would like to sanity-check a configuration change.
My current config has the MTA relaying to multiple mailbox servers using
transport_maps with entries like:
example.com foo:[a.example.com]
example.net foo:[a.example.com]
example.org bar:[b.example.com]
It works fine. I get per-domain delivery routing and can use
defer_transports to pause delivery on a per-server basis. But it's
annoying and a bit error prone having the nexthop specified repeatedly
in transport_maps.
I'd rather specify it once for each transport. Those are delivery smtp
clients, so it's too late to use relayhost. But I did find the
best_mx_transport option:
In master.cf:
testrelay unix - - n - - smtp
-o best_mx_transport=testrelay:[chombo.houseloki.net]:587
-o smtp_fallback_relay=
-o syslog_name=postfix/$service_name
And in the transport_maps db:
test.evilphi.com testrelay:
Which does work:
postfix/testrelay/smtp[41199]: C3F34112532: passing
<[email protected]> to transport=testrelay
postfix/testrelay/smtp[41201]: Untrusted TLS connection established to
chombo.houseloki.net[65.100.43.2]:587: TLSv1.3 with cipher
TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519
server-signature RSA-PSS (4096 bits) server-digest SHA256
postfix/testrelay/smtp[41201]: C3F34112532:
to=<[email protected]>,
relay=chombo.houseloki.net[65.100.43.2]:587, delay=0.77,
delays=0.03/0.03/0.56/0.16, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued
as 6B4199CE)
But that feels like a hack. I'm not specifying nexthop at the "correct"
time, but instead exploiting the handling of a failure scenario.
Is there a better way to do this that isn't what I already have?
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