Intrigued by a complaint about poor logging from Postfix, I decided
to investigate.
What was logged?
Apr 30 14:32:16 generalpurpose postfix/smtp[2299]: 78D1D80AD7:
to=<sa...@tnet.hk>, relay=none, delay=414074, delays=413981/0.19/93/0,
dsn=4.4.1, status=deferred (connect to
mxw.mxhichina.com[47.246.99.195]:25: Connection timed out)
What failed?
connect to mxw.mxhichina.com[ipaddr].
The attempt to connect to mxw.mxhichina.com[ipaddr] failed.
There was no TCP connection, thus no SMTP commands could be
sent, and no SMTP responses could be received.
I like to think that a reasonable person would agree with the above
assessment.
Why did it fail?
Connection timed out.
This is the system-defined error text for an error code that
is defined by a POSIX standard.
I like to think that a reasonable person would agree that regardless
of what the exact error was, an attempt to log SMTP commands or
responses would be pointless, because there was no TCP connection.
Wietse
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