Reverse DNS

0 pts.
Tags:
Administration
Exchange 2003
Spam
I have an Exchange 2003 server that functions fine. My problem is with the amount of spam that gets through the filter I have in place. We are already quarantining too much legit mail to tighten the filters any more. I have RDNS enabled, but don't understand the purpose because when the lookup fails, the message still gets through. Am I missing something? All I can find are articles telling me how to turn RDNS on. RDNS is on, but I want Exchange to reject messages that don't pass the "test". I noticed this when I was looking in the headers of almost all of the spam that we receive. The first part of the header states that "RDNS Failed". I think I must have missed something... Any help/suggestions will be greatly appreciated. thanks, Russ
ASKED: February 2, 2005  11:52 AM
UPDATED: February 3, 2005  12:21 PM

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What filter do you have in place?

I’m lazy when it comes to it. I prefer to employ a third party to do it for me. Mail is passed down to me from an SMTP host that has EMF (www.emailsystems.com) installed on it. They also do a managed service.

This seems to be very effective for my situation, since around half the mailboxes on the server belong to minors and they need to have a tight reign kept on them.

They do a trial (http://www.emailsystems.com/business/trial.php) so i’d give that a go before looking at rejecting RDNS failures.

I’m still willing to see what I can come up with if you would like me to, as the problem interests me. I just think that given what you have said that there may be a better method of solving your problem(s)

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