Re: How to stop inbound mail sent from invalid domains

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mschunk@xxxxxxxxxxxx wrote:

as I understand it...a reverse DNS test..takes the ip address and then
does a reverse to look up the domain name, then comapre that domain
name (if found) to the sender doamin name.

That is:

1) Expensive
2) Unreliable
3) not what I'm asking for.
4) I can't use it anyway.

The "Reverse DNS Test" in ORF is kinda mislabled. It's really doing a
forward lookup on the domain. You can tell it that the domain must
have a MX record, or that MX/A/CNAME is okay. It's /not/ looking for
the PTR record for an IP address.


--
Rich Matheisen
MCSE+I, Exchange MVP
MS Exchange FAQ at http://www.swinc.com/resource/exch_faq.htm
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