> > I have seen this happen a few times unfortunately. It's usually caused > > when a list subscriber installs Microsoft Exchange and configures it to > > pick up mail from their ISP mail server. Basically the user misconfigured > > Exchange and when it goes to pick the messages up it actually sends the > > message back to the list as if it were the original sender (which causes > > people to keep seeing the message over and over). The intended recipient > > never gets the message. Typically this causes an endless loop until you > > remove the problem recipient or take other actions to stop the loop.
> Thanks for the detailed reply. I was able to determine who owns that > server -- a local credit union. Supposing I get a hold of their IT > department, what do I tell them about the misconfigured Exchange server? > What is misconfigured about it? How do they set it right? > > I'm still confused how the server could send mail by bouncing it back. The > list is set up with a list of allowed "posters," but I don't see how the > Exchange server could read a poster address. How do I prevent this in the > future? The list is supposed to be secure in terms of who is allowed to post > to it. First thing comes to my mind is Exchange is poor at best at retrieving messages from other mail servers via POP3. This is known and avoided if at all possible, mainly because of the problem of sorting messages out, and which include many problems with lists. There are some 3rd party apps to help, but it still only recommended if there is no other way. John Tolmachoff MCSE CSSA Engineer/Consultant eServices For You www.eservicesforyou.com To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
