[Mailman-Users] mailman 2.1.14 can send mail but not receive

[Sasse, Fred (DNR)]

Mailman 2.1.4 running on SLES 11.1 with postfix.

Users able to subscribe to lists now and receive the confirmation email.
However, if they reply to the message it is never received.
If they click on the web link they are subscribed to the list.

Users cannot post messages to the list, as the emails are never received.