RE: Mail serving and firewalls

["Walden Leverich" <walden@xxxxxxxxxxxxxxx>]

Everything can be behind the firewall (except of course the firewall
itself). Specifically for SMTP and POP3 you would enable ports 25 and 110 to
pass through the firewall and depending on your SMTP mail feed you may be
able to restrict the port 25 access to only requests coming from a specific
IP address (your SMTP provider). Also, if ALL your POP3 users are going to
be inside your firewall then you don't have to allow port 110 access through
the firewall since the users would all be on the same side of the firewall
as the servers.

-Walden

-----Original Message-----
From: mcsnet!midrange.com!midrange-l-owner@Mcs.Net
[mailto:mcsnet!midrange.com!midrange-l-owner@Mcs.Net]On Behalf Of
Jeffrey M. Carey
Sent: Wednesday, January 14, 1998 4:35 PM
To: midrange-l@midrange.com
Subject: Mail serving and firewalls


We are planning to implement mail serving (pop3 and stmp) on our
AS/400's with Lotus Mail 4.5 (which came with Client Access) as the
desktop client.  Eventually we'll move to Lotus Notes Desktop and Lotus
Domino (we're waiting for the native AS/400 solution next month).

Currently, we don't have a firewall in place.  In implementing a
firewall, do the mail servers need to be outside the firewall?  Do we
need one (less restrictive) firewall to protect the mail servers and one
more restrictive one to protect the rest of the network?  How does
having various servers physically on one AS/400 affect how we set things
up?

We currently have 2 AS/400's - a 50S for development and a 530 for
production.  We are running on a TCP/IP token ring LAN. Any input would
be appreciated!
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