RE: Open Mail Relay - Exchange 5.0

  • From: "Richard Pettigrew" <Richard@xxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Sat, 11 May 2002 20:58:40 +0100

Thanx, that has helped me!

Although, I have also been able to improve security by using some Access 
Control Lists in my router. AZLAN's Cisco Tech Support is Superb!

If anyone else out there is interested in the ACL's for Cisco IOS 12.x (800 
Series) drop me line and i'll be glad to send you script.

-----Original Message-----
From: Thomas Brennan [mailto:tbrennan@xxxxxxxxxxxxx]
Sent: 10 May 2002 15:28
To: [ExchangeList]
Subject: [exchangelist] RE: Open Mail Relay - Exchange 5.0


http://www.MSExchange.org/


Richard,

See http://www.exchangeadmin.com/Articles/Index.cfm?ArticleID=7696

Thomas Brennan
Federated Systems Group
Corporate Website : www.fedsysgrp.com
ISP Business : www.yourhostingpartner.com
Off-Site Media Storage : www.datasafe-nj.com


-----Original Message-----
From: Richard Pettigrew [mailto:Richard@xxxxxxxxxxx] 
Sent: Friday, May 10, 2002 9:40 AM
To: [ExchangeList]
Subject: [exchangelist] Open Mail Relay - Exchange 5.0


http://www.MSExchange.org/


Hi there, I need some advice on closing and open mail relay.

The difficulty I am facing is that it is Exchange version 5.

The server in question is an old SBS 4.0 server.

The setup is as follows:

Single server with one netcard.
Private IP Address 10.x.x.x range
Cisco801 router on 10.0.0.1 - router is using NAT

My question is this; how do i configure Exch 5 to only allow specified
smtp server ip's to connect to it? But if the NAT on the router
translates all incomming addresses on port 25 then surely the exchange
server will only ever see the originating address connecting to it as
that of router's internal address.

If this is the case, then should I bee looking at getting a hardware
firewall? (as well as obviously upgrading the exchange server!)

all comments gratefully appreciated.

Richard Pettigrew
Harkins & Anderson Ltd

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