When my main postfix rejected a message due to
reject_unknown_client_hostname:
Apr 18 10:27:12 mail postfix/smtpd[129429]: NOQUEUE: reject: RCPT from
unknown[194.33.39.17]: 450 4.7.25 Client host rejected: cannot find your
hostname, [194.33.39.17]; from=<x...@a.com> to=<y...@b.com> proto=ESMTP
helo=<mx.a.com>
I found this message was re-delivered by peer MTA to my secondary MX
quickly.
So my question is, smtp code 450 will cause the sender to retry delivery
to secondary MX?
Thank you
Tom
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