Hi. I was wondering if perhaps your list is being "broadcast" via some exploder list...I may not be using the right terms, but this is how it was explained to me. If someone has taken your list and is broadcasting it to another bunch of people, and if one of *them* is in error, the errors come back to you...and you can't find them. I might try looking for something on my list that looks like a suspicious provider..like sometimes people join my list with the email id LACTNETer@xxxx.com.... If the name of your list is in the email id of the subscriber, that may indicate that the address is the gateway to the exploder list... I hope this is clear. I am not explaining this properly, I fear, but perhaps someone here knows more. Kathleen Kathleen B. Bruce, BSN, IBCLC co-owner Lactnet,Corgi-L,TLC, Indep. Consultant http://together.net/~kbruce/kbbhome.html LACTNET Archives http://library.ummed.edu/lsv/archives/lactnet.html