Mar 17 09:00:01 mail postfix/smtpd[1001]: connect from unknown[192.0.2.10]
Mar 17 09:00:02 mail postfix/smtpd[1001]: 123ABCD: client=unknown[192.0.2.10]
Mar 17 09:00:03 mail postfix/cleanup[1002]: 123ABCD: message-id=<test-1@example.com>
Mar 17 09:00:04 mail postfix/qmgr[900]: 123ABCD: from=<admin@example.com>, size=1024, nrcpt=1 (queue active)
Mar 17 09:00:05 mail postfix/smtp[1003]: 123ABCD: to=<dest@example.org>, relay=mx.example.org[198.51.100.10]:25, delay=1.2, delays=0.2/0.1/0.6/0.3, dsn=2.0.0, status=sent (250 2.0.0 Ok)
Mar 17 09:00:05 mail postfix/qmgr[900]: 123ABCD: removed