Strange situation ...

I know one user(my neighborhood) that have such problem: He had everything worked well until one day, when he realised, that he can not send his messages to suse-linux-e board(as "ezmlm program" said - they bounced), but new messages he still can recieve - whit this there are no problems. Now he recieved "ezmlm warning" message in which was told, that "ezmlm programm" will send a probe message, and if it bounces too it will unsubscribe him from suse-linux-e list. How such problem can be solved ??? Thank you for any advice. -- --- ... and may the Force be with you ...