Port forward smtp with multiple sources

[acerimmer10]

Hi,

We are looking to replace our current router with PFSense but are having trouble working out how to do the following.

On our current router when we port forward smtp (25) to our mail server we only accept connections from a group of server as our external spam filters use a bunch of IP Addresses.

How do we add the ability to accept (i.e. the source) be multiple IP addresses or is this something that we have to perform in the firewall.

Any help on direction would be useful.

Thanks

[jimp]

Firewall > Aliases, add the IP addresses/networks of the provider.

The in the WAN rules:

pass TCP from (that alias) to (your mail server) port 25.