May 11 10:00:01 mail postfix/smtpd[12345]: connect from unknown[192.168.1.100]
May 11 10:00:02 mail postfix/smtpd[12345]: ABC12345: client=unknown[192.168.1.100]
May 11 10:00:03 mail postfix/cleanup[12346]: ABC12345: message-id=<test@example.com>
May 11 10:00:04 mail postfix/qmgr[12347]: ABC12345: from=<sender@example.com>, size=1234, nrcpt=1 (queue active)
May 11 10:00:05 mail postfix/smtp[12348]: ABC12345: to=<recipient@example.com>, relay=example.com[1.2.3.4]:25, delay=1.2, delays=0.1/0.1/0.5/0.5, dsn=2.0.0, status=sent (250 OK)
May 11 10:00:06 mail postfix/qmgr[12347]: ABC12345: removed

May 11 10:01:01 mail postfix/smtpd[12350]: connect from unknown[192.168.1.101]
May 11 10:01:02 mail postfix/smtpd[12350]: DEF67890: client=unknown[192.168.1.101]
May 11 10:01:03 mail postfix/cleanup[12351]: DEF67890: message-id=<test2@example.com>
May 11 10:01:04 mail postfix/qmgr[12347]: DEF67890: from=<another@example.com>, size=5678, nrcpt=2 (queue active)
May 11 10:01:05 mail postfix/smtp[12352]: DEF67890: to=<user1@example.com>, relay=example.com[1.2.3.4]:25, delay=1.3, dsn=2.0.0, status=sent (250 OK)
May 11 10:01:06 mail postfix/smtp[12353]: DEF67890: to=<user2@example.com>, relay=example.com[1.2.3.4]:25, delay=1.4, dsn=2.0.0, status=sent (250 OK)
May 11 10:01:07 mail postfix/qmgr[12347]: DEF67890: removed