Hello postix-users,
A postfix host should forward any message, that cannot be delivered at the
first attempt to a fallback relay.
I've a separate smtp transport:
master.cf:
smtp_with_fallfack unix - - - - - smtp
-o syslog_name=postfix/with_fallback
-o smtp_fallback_relay=[fallback_relay.example]:587
main.cf:
default_transport = smtp_with_fallfack
smtp_tls_security_level = dane
soft_bounce = yes
This will try normal delivery to any remote MX destination and use my default
"smtp_tls_security_level = dane"
On delivery failures, postfix use the fallback_relay.
The connection to [fallback_relay.example]:587 also use STARTTLS to secure the
connection.
https://www.postfix.org/postconf.5.html#smtp_fallback_relay say "The fallback relays
must be SMTP destinations."
If I try "-o smtp_fallback_relay=[fallback_relay.example]:465" I get this log:
Feb 27 22:35:58 mta postfix/with_fallback/smtp[7326]: SMTPS wrappermode (TCP port 465) requires
setting "smtp_tls_wrappermode = yes", and "smtp_tls_security_level = encrypt"
(or stronger)
OK, using SMTPS only for the connection to the fallback_relay seems not
possible as documented, right?
Or are there other ways, I've not seen yet?
My goal is to use SMTPS for most/many/all connections between postfix
instances, I operate ...
Andreas
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