Jim,
Checking reverse dns before connect is only a first step in the battle
against UCE. I have seen lots of great postfix how-tos that explain numerous
ways to help you fight SPAM.


http://www.postfix.org/uce.html This will help with your Reverse DNS (look
for reject_unknown_client)

Also check out some of the other resource on the postfix.com homepage under
the UCE/Virus Section
http://www.postfix.com/docs.html

--Colin.ansel.Rasor



On 8/17/05 10:25 AM, "Jim B" <elemint@gmail.com> wrote:

> How can postfix be configured so that postfix will do a reverse dns on
> incoming mail and if it fails then the mail will not be accepted or will be
> discarded?
> 
> 
> Jim
> 
> 
> 
> 
> 
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