Hi there,
How to Change the Outbound TCP Port
NOTE: Every remote SMTP server that you want to communicate with must be configured to accept connections on the specified port. In most cases, you do not want to change the default port setting.
To change the outbound TCP port, follow these steps:
1. Start the Exchange System Manager.
2. Locate and click Servername, click Protocols, and then click SMTP.
3. Right-click the Default SMTP Virtual Server object, and then click Properties.
4. Click the Delivery tab, and click the Outbound connections button. Set the TCP port to 26 (or whatever value you require).
5. Quit the Exchange System Manager for the changes to take place.
All outbound SMTP traffic is now sent to port 26 on other servers.
Hope this helps
-FB