Thanks to those of you that replied to my earlier posting. The problem is still ongoing with other members of my list. When they attempt to post, they get messages that tell them that they are not authorized to post. The same message will go through if they try again.
I have the dist and accept lists set up identically, e.g. everyone who is authorized to receive messages posted to the list can also post to the list. Further, some of the "Mail delivery subsystem" error messages I am receiving are showing that my own address (the one from which I am posting this message and to which I receive more than 100 messages a day) is invalid. I freely admit to being a dope in this area, so if anyone has any suggestions that will make administration of this list a bit more smooth, I would appreciate hearing about them.
Tim Dees tim@timdees.com