Make sure the sending address is not subscribed with "NOPOST".

Check the LISTSERV spool folder to see if the mail is still sitting 
there being refused by the SMTP forwarding server.

Check the mail logs to see if the mail was ever sent.

-- 
Francoise Becker <[log in to unmask]>

Knowledge is just a click away: http://www.lsoft.com/optin.html