[Mailman-Users] help for problem "mail not sent, user unknown"

[Xiangguang Liu]

Hello,

Does anybody know how to solve the following problem?
When I sent Email from our lab's Email account(using pine) to mailman's 
mailing list, say xxx at xxx.xxx
error message is, "mail not sent, .1.1 <xxx at xxx.xxx>... user unknown".
But I can send Email from other mail account to this mailman mailing list. 
Is Email server's problem? Thank you very much.

Sean

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