2 servers 1 internet connection

[MacGyver]

Hey all,

I would like to setup two separate fedora web/pop3/smtp servers on two different computers, through a router. I have used the virtual host on one computer and that worked great but I can not figure out how to set up the mail part using Postfix and Dovecot. here is what I would like to do:

domain1.com to internal 192.168.1.10:80
domain2.com to internal 192.168.1.11:80

I have tried setting up this configuration:

domain1.com to internal 192.168.1.10:80
domain2.com to internal 192.168.1.11:81

but they would have to enter the port number and I would like to avoid that,
I was thinking setting up DNS would work but am not sure of this.

Any help would be greatly appreciated,
MacGyver