I concur with James - my m0n0 box at home has both ports 25 and 80 answering
on the WAN interface quite successfully.

Can I suggest trying to run the NAT rules you were planning on running on
ports 26 and 81 respectively, and see if they work that way.

Unfortunately, these days it's not uncommon for ISPs to block port 25. A
sign of the virus/trojan-infested times I guess. In fact, it's becoming
quite a challenge to find ISPs that *don't* block port 25.

Regards,

Chris
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