----- Original Message ----- 
From: "Micheal Patterson" <[EMAIL PROTECTED]>
Sent: Friday, September 12, 2003 7:58 AM
Subject: Sendmail Spam Block question.

> I'm getting numerous spam messages that are coming in with headers such
> <snip>
> Received: from 67.66.xxx.x. ([])
> Where 67.66.xxx.x is the actual Ip of my sendmail server and the actual
> sending host is Is there any way to block this type of spam
> other than blocking I can't place the ip in the access list
> as it kills outbound mail from that system.
> Thanks.
> --
> Micheal Patterson
> Network Administration
> Cancer Care Network
> 405-917-0600

I realize that I'm responding to my own initial message, but after reading
it again, let me clarify.

The source of the spam is, it's spoofing the hostname portion
as 67.66.xxx.x which is the IP of my mx. Is there any way to configure
Sendmail that, in this example, if it recieves connection that has the
hostname field of 67.66.xxx.x. and it doesn't resolve back to the ip, to reject the message?

Micheal Patterson
TSG Network Administration

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