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可以参考:http://www.sendmail.com/sm/open_ ... ral_issues_faq/#4.8
关键是“Unless this happens very often, you can ignore this. If it happens very often, it's either someone playing around or it's a network problem.”这句。如果偶尔发生则可以忽略,如果经常发生那肯定是有人在捉弄你或者是一个网络问题。
What does "NOQUEUE: Null connection from ..." mean?
An entry like:
NOQUEUE: Null connection from host.domain [IP.AD.DD.RESS]
in the logfile means that host.domain connected to your MTA but neither initiated transmission of a message (by issuing the MAIL command), nor used any of the commands that are logged separately (EXPN/VRFY/ETRN). Unless this happens very often, you can ignore this. If it happens very often, it's either someone playing around or it's a network problem.
Note 1: The significant part of the message isn't the NOQUEUE, but the "Null connection from ...". In particular, NOQUEUE isn't an error indication, but just a "place-holder" when no queue ID has been assigned, typically because message collection hasn't started (yet). It can occur in other messages too, and there too the significant part is what comes after the NOQUEUE.
Note 2: In 8.10, the text which led to the confusion has been changed to: "... did not issue MAIL/EXPN/VRFY/ETRN during connection to ...". |
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