Here is what I get in the error log --
Diagnostic information for administrators:
Generating server: mailserver.DOMAIN.org
IMCEAMAILTO-Fname+2ELastname+40(address through dedicated tunnel)+2Ecom@INTERNALDOMAIN.org
#550 5.4.4 ROUTING.NoNextHop; unable to route ##
Original message headers:
Received: from mailserver.Domain.org ([MailServerIP]) by MailServer.Domain.org
([MailServerIP]) with mapi; Mon, 5 Apr 2010 14:59:37 -0500
Content-Type: application/ms-tnef; name="winmail.dat"
So what is this message saying? I am sending mail with an attachment to a facility where we have a dedicated tunnel setup for traffic. I can send other mail messages but this extension seems to have problems.