Simple answer...  Firewall.

Longer answer...  Have a good look at your network topology and ask
yourself why that exchange server is visible to the outside world at
all.

Phil

----
Phil Randal
Network Engineer
Herefordshire Council
Hereford, UK  

> -----Original Message-----
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On 
> Behalf Of Weathersby, Bryce
> Sent: 23 November 2004 15:08
> To: Exchange Discussions
> Subject: Simple question about IMS
> 
> Ok Guys n gals.. This maybe a dummy question but here goes...
> 
> 
> We have a mail gateway product and I have implemented it with 
> no problems..
> Now my boss has come to me stating he is getting email that 
> should be filtered. I looked and sure enough he is, and after 
> checking the headers, they spammer is sending straight to the 
> Exchange Box.
> 
> I need to know how my Exchange 5.5 box can be setup to ONLY 
> receive email from my Mail gateway. Biggest problem is that 
> the Exchange box has a real routable IP and no way to change that...
> 
> Thanks
> 
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