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[求助] 421 Service not available, closing transmission channel Grey listed.

421 Service not available, closing transmission channel Grey listed
Mar  9 10:55:33 mailcenter sendmail[11254]: o292tXZb011254: from=<service@*.com>, size=9671, class=0, nrcpts=1, msgid=<10707071.1268103346002.JavaMail.root@actools-1>, proto=ESMTP, daemon=MTA, relay=[192.168.80.3]
Mar  9 10:55:35 mailcenter sendmail[11256]: STARTTLS=client, relay=bdc-edge02.com., version=TLSv1/SSLv3, verify=OK, cipher=AES256-SHA, bits=256/256
Mar  9 10:55:41 mailcenter sendmail[11256]: o292tXZb011254: to=<xie.k@edge02.com>, ctladdr=<service@*.com> (60109005/60109005), delay=00:00:08, xdelay=00:00:08, mailer=esmtp, pri=129671, relay=bdc-edge02.com. [192.44.18*.14], dsn=5.0.0, stat=Service unavailable
Mar  9 10:55:41 mailcenter sendmail[11256]: o292tXZb011254: o292tfZb011256: DSN: Service unavailable

dsn=4.0.0, stat=Deferred: 421 Service not available, closing transmission channel Grey listed.

有人知道为啥?
多谢
对应的灰名单有问题??
http://www.chifeng.name
http://extmail.org
http://postfix.org.cn
-------- chifeng
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