Postfix : where’s sender come from ?

By human

root@mirabilis:/etc/postfix# grep D71E74800F7 /var/log/mail.log
Apr 26 10:44:25 mirabilis postfix/smtpd[9783]: D71E74800F7: client=unknown[49.156.60.6]
Apr 26 10:44:25 mirabilis postfix/cleanup[9787]: D71E74800F7: message-id=<20120423054426.364DA808843@mth-box.localdomain>
Apr 26 10:44:26 mirabilis postfix/qmgr[8934]: D71E74800F7: from=<>, size=27967, nrcpt=1 (queue active)
Apr 26 10:44:30 mirabilis postfix/smtp[9143]: D71E74800F7: to=, relay=gmail-smtp-in.l.google.com[173.194.79.26]:25, delay=4.3, delays=0.61/1.9/0.52/1.2, dsn=2.0.0, status=sent (250 2.0.0 OK 1335411870 it6si737491pbc.260)
Apr 26 10:44:30 mirabilis postfix/qmgr[8934]: D71E74800F7: removed

lalu yang ini yang membuat bingung

Apr 26 10:49:43 mirabilis postfix/qmgr[9959]: 2F94B4800F9: from=, size=48454, nrcpt=1 (queue active)
Apr 26 10:49:44 mirabilis postfix/smtp[11946]: 2F94B4800F9: to=, relay=mx.mailix.net[66.11.225.84]:25], del
ay=318, delays=317/0.01/0.87/0.33, dsn=5.0.0, status=bounced (host mx.mailix.net[66.11.225.84] said: 550 unrouteable address
(in reply to RCPT TO command))
Apr 26 10:49:44 mirabilis postfix/cleanup[11948]: AAAE04800F1: message-id=<20120426034944.AAAE04800F1@smtp.net.id>
Apr 26 10:49:44 mirabilis postfix/bounce[11947]: 2F94B4800F9: sender non-delivery notification: AAAE04800F1
Apr 26 10:49:44 mirabilis postfix/qmgr[9959]: AAAE04800F1: from=<>, size=50377, nrcpt=1 (queue active)
Apr 26 10:49:44 mirabilis postfix/qmgr[9959]: 2F94B4800F9: removed
Apr 26 10:49:47 mirabilis postfix/smtp[11946]: AAAE04800F1: to=, relay=gmail-smtp-in.l.google.com[173.194.
79.27]:25], delay=2.8, delays=0.05/0/0.61/2.1, dsn=2.0.0, status=sent (250 2.0.0 OK 1335412187 rb2si2138145pbc.5)
Apr 26 10:49:47 mirabilis postfix/qmgr[9959]: AAAE04800F1: removed

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