Postfix logs delays in fine detail including the delays of address probe messages: time in incoming/deferred queue, time in active queue, time to complete DNS lookup and TCP/SMTP/LMTP handshake, time to transmit message.
Apr 10 13:02:15 mail postfix/smtpd[24851]: connect from mycomp.mydomain.com[2a01:XXX:5] Apr 10 13:02:15 mail postfix/cleanup[24902]: E0779184C1: message-id=<20090410110215.e077918...@mail.mydomain.com> Apr 10 13:02:15 mail postfix/qmgr[14128]: E0779184C1: from=<double-bou...@mydomain.com>, size=261, nrcpt=1 (queue active) Apr 10 13:02:15 mail postfix/lmtp[24965]: E0779184C1: to=<testm...@testdomain.com>, relay=mail.mydomain.com[/var/imap/socket/lmtp], delay=0.04, delays=0.04/0/0/0, dsn=2.1.5, status=deliverable (250 2.1.5 ok)
Apr 10 13:02:15 mail postfix/qmgr[14128]: E0779184C1: removed [15 seconds elapses, my client is waiting the answer for RCPT]Apr 10 13:02:30 mail postfix/smtpd[24851]: EBC03184C1: client=mycomp.mydomain.com[2a01:XXX:5] Apr 10 13:02:30 mail postfix/smtpd[24851]: disconnect from mycomp.mydomain.com[2a01:XXX:5]
smime.p7s
Description: S/MIME Cryptographic Signature
