On 3/26/04 at 4:54 PM -0500, Yakov Shafranovich wrote:
Pete Resnick wrote:
In something like MTA MARK, you're seeing if the IP address and
seeing if it exists in a place in the in-addr.arpa domain.
Jeez, you'd think I could write in actual English syntax! Let's try:
In something like MTA Mark, you're seeing if the IP address itself
exists in some record in the in-addr.arpa domain.
We should probably clarify that this is not the same as a rDNS check
to see if an IP has an rDNS record.
Right. The key thing is that in the MTA MARK case, there is no
identity in the message envelope or body from which you'll get a
domain and look for the IP address. The domain is *always* the
in-addr.arpa domain, and you'll look to see if the appropriate
"anti-spam" record exists there for that IP address. (But *not* just
a PTR record.)
pr
--
Pete Resnick <http://www.qualcomm.com/~presnick/>
QUALCOMM Incorporated