You need to give us more information on the first delivery error, like the
text of the message which you recieved with all of the headers attached.
Delivery errors come in many different flavors....Can you send us the
entire header information of the message, leaving out, of course, any
addresses and names if the list is confidential?

As for your other question, I hope somebody more versed in listserv thn I
am will be able to help you.

Glenn