系统没有邮件的时候，怎么经常有这样的日志呢，看队列也是空的

bladezxf

Apr 21 10:11:52 test postfix/pickup[2330]: 5C60F28C32: uid=0 from=<root>
Apr 21 10:11:52 test postfix/cleanup[2331]: 5C60F28C32: message-id=<20080421021152.5C60F28C32@mail.extmail.org>
Apr 21 10:11:52 test postfix/qmgr[1972]: 5C60F28C32: from=<root@mail.extmail.org>, size=643, nrcpt=1 (queue active)
Apr 21 10:11:53 test postfix/smtpd[2336]: connect from localhost.localdomain[127.0.0.1]
Apr 21 10:11:53 test postfix/smtpd[2336]: 8FAA328C31: client=localhost.localdomain[127.0.0.1]
Apr 21 10:11:53 test postfix/cleanup[2331]: 8FAA328C31: message-id=<20080421021152.5C60F28C32@mail.extmail.org>
Apr 21 10:11:53 test postfix/qmgr[1972]: 8FAA328C31: from=<root@mail.extmail.org>, size=1093, nrcpt=1 (queue active)
Apr 21 10:11:53 test amavis[2105]: (02105-05) Passed CLEAN, <root@mail.extmail.org> -> <root@mail.extmail.org>, Message-ID: <20080421021152.5C60F28C32@mail.extmail.org>, mail_id: uv1R1GLlx1D9, Hits: 0.141, size: 643, queued_as: 8FAA328C31, 1148 ms
Apr 21 10:11:53 test postfix/smtpd[2336]: disconnect from localhost.localdomain[127.0.0.1]
Apr 21 10:11:53 test postfix/smtp[2334]: 5C60F28C32: to=<root@mail.extmail.org>, orig_to=<root>, relay=127.0.0.1[127.0.0.1]:10024, delay=1.5, delays=0.23/0.03/0.03/1.2, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 8FAA328C31)
Apr 21 10:11:53 test postfix/qmgr[1972]: 5C60F28C32: removed
Apr 21 10:11:53 test postfix/virtual[2340]: 8FAA328C31: to=<root@mail.extmail.org>, relay=virtual, delay=0.29, delays=0.1/0.1/0/0.1, dsn=5.1.1, status=bounced (unknown user: "root@mail.extmail.org")
Apr 21 10:11:53 test postfix/cleanup[2331]: D6E3C21857C: message-id=<20080421021153.D6E3C21857C@mail.extmail.org>
Apr 21 10:11:54 test postfix/qmgr[1972]: D6E3C21857C: from=<>, size=2920, nrcpt=1 (queue active)
Apr 21 10:11:54 test postfix/bounce[2342]: 8FAA328C31: sender non-delivery notification: D6E3C21857C
Apr 21 10:11:54 test postfix/qmgr[1972]: 8FAA328C31: removed
Apr 21 10:11:54 test postfix/virtual[2340]: D6E3C21857C: to=<root@mail.extmail.org>, relay=virtual, delay=0.29, delays=0.24/0/0/0.05, dsn=5.1.1, status=bounced (unknown user: "root@mail.extmail.org")
Apr 21 10:11:54 test postfix/qmgr[1972]: D6E3C21857C: removed