On Sun, 13 Sep 2009, Rajesh M wrote:

i sometimes get spam with both the sender id and recipient id as the same. Obviously such emails are originating outside my server.

I DO NOT wish to user SPF

Why not, if I may ask? Publishing an SPF record seems to cut down on how much your domain is used in sender address forgery.

3) If the domain is from my server and the ip address is not my server
   ip then reject that email

How do i achieve this please ?

It's best to do this sort of poison-pill blacklisting at SMTP time in the MTA, if at all possible, and avoid the overhead SA introduces. What MTA software do you use? Some can be configured to do this natively.

I use milter-regex with Sendmail to reject any message that claims to be from my domain but doesn't originate from my network. There are some other high-value tests it performs as well.

You can see my sample config at http://www.impsec.org/~jhardin/antispam/

--
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