Problem with listserver

[Gareth Gammon]

Good morning again!
Everytime I post a notice to the listserver I get the following mail
back:

From: "Mailer-Daemon" <Mailer-Daemon at Capaccess.org>
Sorry. Your message could not be delivered to:

wmarshal,Capaccess (The name was not found at the remote site. Check
that
the name has been entered correctly.)

and then my message is correctly posted. Does anyone know what this
means and how to fix it? Its no big deal I guess, but I get three
replies from the listserver for every one  that I post.

Thanks,
Gareth VE7CGG

Listserver Subscription:listserv at listserv.tempe.gov - "subscribe heath 'name' 'call'"
Listserver Submissions: heath at listserv.tempe.gov
Listserver Unsubscribe: listserv at listserv.tempe.gov - -"signoff heath"