We have SMTP Service disabled, so it can't be that. We think it could be because we restarted IIS, but I have no idea why this would cause it to stop working. Jonathan Blankenship Internet Development MBS Textbook Exchange, Inc. Ph (573) 446-5248 Ext. 5138 Andrew Bosch <Andrew.Bosch@ELC A.ORG> To Sent by: LISTSERV [log in to unmask] list owners' cc forum <[log in to unmask] Subject ASE.LSOFT.COM> Re: Listserv went down 12/20/2005 03:44 PM Please respond to LISTSERV list owners' forum <[log in to unmask] ASE.LSOFT.COM> Do you have the SMTP Service running with IIS? Listserv and the SMTP Service do not play nice together. andrew >>> [log in to unmask] 12/20/2005 2:34:13 PM >>> We restarted IIS and now Listserv (version 1.8d) is no longer able to send messages. When we try we get this error: Error transferring to LISTPROC.MBSBOOKS.COM; SMTP Protocol Returned a Permanent Error 550 5.7.1 Unable to relay for [log in to unmask]