mail proxy?

["Bob McIlvaine" <suemac@empire.net>]

Hi all,

This probably falls into the newbie category...so, please be 
gentle. :-)

Given a home network with an openBSD dialup gateway & 
firewall to my ISP. I'm wondering if it is possible to set up, 
what I'll call, a mail proxy server.

The idea is to have the proxy server get the mail from the isp 
or multiple isps, scan for viruses and then be available to 
email clients behind the firewall.

What I'm looking for are the right terms to describe this and 
any pointers to info on the net where I can read up on what 
software I need to make such a mail configuration.

My first search for email proxy got little of useful content.

Thanks in advance for any references or help.

Mac