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

[Xiangguang Liu]

Hello,

Does anybody know how to solve the following problem?
I create a mail list, but when I send mail to this list(say, xxx at xxx.xxx) 
from our lab's
Email account(from pine), error message is:
"mail not sent, .1.1<xxx at xxx.xxx>user unknown". But it is OK when sending 
mail to the mail list with
other Email account which is not from our lab. Is it mailman's problem or 
our lab's Email server's problem?

Thanks a lot.

Sean



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