"LISTSERV site administrators' forum" <[log in to unmask]> wrote on 03/05/2004 02:50:32 PM: > Our LISTSERV server is set to use our Exchange 5.5 SP4 server for sending > messages. Worked great until we had some issues with viruses and spam. > > Now, LISTSERV will send messages to internal addresses fine, but addresses > outside of our domain don't ever get delivered. There has to be a simple > solution, but I can't find it. > > The SMTP_forward setting in LISTSERV is set to mail.ourdomain.com like it > always has been. > > Exchange is set to accept relay from the LISTSERV server's private IP > address, but nowhere else. > > I get no error messages. The only way we know that a message hasn't been > delivered to the external addresses is when someone calls. > > Any ideas where to start? Have you looked at the Exchange logs? Is the message getting that far? Have you tried a manual connection from the listserv machine to the exchange server (telnet mail.ourdomain.com 25) to verify Excahnge will still accept connections? How about manually forging a message on that connection? What is the listserv log showing when it processses a message?