When something comes back "user unknown" it usually means that email
address is no longer good.... however as a listowner of several lists I
get error messages all the time that say "user unknown" when in fact the
emai address _is_ good... many isp's just use that "user unknown" for a
general statement like if they are upgrading, or if the mailbox is full
for that person etc.
What I would suggest is that you try again a few more times, and if it
still comes back user unknown over the space of a few days, then you can
safely guess that email is no longer good.
Also, remember to specify a subject when you send a message to the list
Maura Petzolt Mobile Alabama USA
Helpful Hints for Successful Searching