[Mailman-Users] Mailman can't send mail

[Can Cizer]

The problem has changed a little bit :). Now, the mailman can send the
messages inside the domain server,but it cannot send any messages to outside
like gmail,hotmail or yahoo.I checked the "smtp-failure" log and it is
written that "delivery to can.cizer at gmail.com failed with code 553: sorry,
that domain isn't in my list of allowed rcpthosts (#5.7.1)".