Have 2 users outside of my WAN that get e-mail using smtp. Mail server is Microsoft Exchange and clients are using Microsoft Outlook. When I forward port 23 to the Spam & Virus Blocker, the users are no longer able to connect to the mail server (smtp.domain.com). What setting am I overlooking?
Thanks to everyone who replied.
Think there was a little confusion on what I was trying to accomplish. Needed for a user to get to his e-mail remotely using Microsoft Outlook, just as if you were checking your personal Comcast, AT&T, etc. account from home.
Short version is that the Cisco Spam & Virus Blocker does not support users outside of the network (lan, wan, etc.). This leaves no way for a user working remotely to connect to the Mx server and login. Was able to bypass the problem with the following solution.
Forward port 25 to Spam Blocker from the firewall
Forward alternate port 2525 to internal port 25 pointed to my mail server.
Works like a charm and the Spam blocker is still able to filter the e-mail before the remote user downloads it to his inbox.