Append one or more "-v" options to selected daemon
definitions in /etc/postfix/master.cf and type "postfix reload".
This will cause a lot of activity to be logged to the syslog daemon.
Example:
/etc/postfix/master.cf:
smtp inet n - n - - smtpd -v
This makes the Postfix SMTP server more verbose. To diagnose
problems with address rewriting one would specify a "-v"
option for the
cleanup(8) and/or
trivial-rewrite(8) daemon, and to
diagnose problems with mail delivery one would specify a "-v"
option for the
qmgr(8) or
oqmgr(8) queue manager, or for the
lmtp(8),
local(8),
pipe(8),
smtp(8), or
virtual(8) delivery agent.
