Yes, trying to send from My CallPilot, Outlook Express, or the Nortel Fax printer which allows you to fax from any application. My server is set up with an FQDN, and everything else seems to be working OK.
When sending to an internal recipient, My CallPilot creates an address of 1234567890@inpmwrocallpilot.mydomain.com (where 123456 is our VPIM shortcut and 7890 is the mailbox). When trying to send to an external fax, it creates FAX=914025551212@inpmwrocallpilot.mydomain.com. I did a network trace (watched the actual traffic). It's sending to the CallPilot server using SMTP, so everything is in plain text. When it sends to the internal recipient, everything goes through fine. When sending to the outside recipient, as soon as the server sees the destination address, it responds with a message about not being able to route messages to "inpmwrocallpilot.mydomain.com".
One thing I thought of today, and I don't know if it matters, but... The server name is CALLPILOT (the default), but the FQDN is "inpmwrocallpilot.mydomain.com". When setting it up, we tried to make the server name INPMWROCALLPILOT, but it was too long. Would the fact that the host part of the FQDN and the server name don't match make any difference? I looked through the documentation and didn't see any requirements that they match, but thought I would throw that out there just in case.
Thanks,
Matt