[Mailman-Users] Posting Held for Approval ?why?

[Xiao Bing]

My posting email always need to be approved.Why?
I get this msg from administrator page.
-----------------------------------------------------------------------------
Blind carbon copies or other implicit destinations are not allowed.  Try
reposting your message by explicitly including the list address in the To: or
Cc: fields.
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Who can tell me why?I am so crazy now.
                                         Jack
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