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Port Forwarding for port 25

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by quintar51

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Not sure if this is called port forwarding or not.

Anyways, I know that port 25 is used for SMTP, and is also used by trojans and spam, and that's the last thing I want.

I have a win2k exchange server sp3, behind a Dlink 604 router. In the router interface, there's the option to allow SMTP through. It has a private and a public port.

Both private and public ports are at 25, and everything is working great. However, if I change the private port to something else, that's not being used, will I still be able to receive email?
Is there a setting that I will need to change on the exchange server at all?
Is this scenario possible, or do both private/public ports have to be the same?

4 replies

by cg it

Quintar, you can do what you want and yes you have to reconfigure E2K to listen on a port other than 25 so that mail fowarded by the router reaches E2K.

But another way to defend against trojans and spam would be to use something like ISA serverand Norton's Enterprise Anti-Virus software and not allow public fowarding of email through your E2K.

To change what port E2K is listening on for SMTP change the Exchange STMP IIS Virtual server [you created for your domain] port settings to listen on a port other than 25. Have your router foward inbound port 25 traffic to that port you've assigned to Exchange.

by quintar51

Thanks DR,
but I'm this is only for my home network at home. I'm not going to install ISA there :) I'll just change the port.

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