[KLUG Members] Sendmail as POP3?

[bill]

Is it possible to make Sendmail act as a POP3 server?

It sounds counterintuitive, I guess, with it being called SENDmail, so let me
explain what I'm trying to do.

To help combat spam, it might be helpful if I could have a POP3 server block
certain IP addresses.  Those address lists are available, etc. etc.

I have several POP3 servers available on the web.  I'd like to keep them as is
(they're linked with domain names, etc.).

I have a Linux box inside a local network that is sending mail from all the
other internal boxes out to the appropriate places on the web.  So if machine
192.168.0.7 wants to send mail, the mail is sent to machine 192.168.0.8 (linux
box) which has Sendmail configured to receive email from there and send it on
its way (through a firewall) out to the wild, wild web.

Can I do -more- to that Sendmail box so that it goes to the POP3 servers on the
web, grabs the mail from there, filters out the bad ip addresses and acts as a
POP3 server to all the internal machines?

kind regards,

bill hollett