I think, through the help of Valdis, that I've tracked the problem to the user's email system. Every email that has been sent to them gets a "posted to the list" from Listserv and "250 ok" through LSMTP. So I contacted their provider (evenlink.com) and am waiting for an answer. Thank you to all that responded. If this doesn't turn anything out, I'll probably be back begging for more help ;-) Conor -----Original Message----- From: Pete Weiss [mailto:[log in to unmask]] Sent: Thursday, February 14, 2002 2:35 PM To: [log in to unmask] Subject: Re: Email addresses being blocked? Also have the subscriber mail LISTSERV@listhost thanks info q LISTNAME I guess is would not hurt for you to issue SERVE user1 SERVE user2 At 14:17 02/14/2002 Thursday, Valdis Kletnieks wrote: >Start checking your logs. > >1) Check listserv.log - did Listserv actually *send* them a posting? > >2) Check your listserv's MTA logs - did it receive the posting from listserv? > >3) Check your MTA logs - did it forward the posting to another server? If not, >why not? If it did, what server did it send it to? > >4) Contact the owner of THAT server. > >5) Repeat 3 and 4 until you either find the mail, or an explanation.