Hi, Markus-
We don't block on a missing PTR record, but some people do. There are people
who block if the PTR record doesn't match the HELO or EHLO string, and some
who block if the HELO/EHLO, PTR, and A records don't match perfectly.
IMO, anybody who blocks based on a failing a single test is not doing their
clients any favors. There are exceptions to that, of course - for known
spammers, etc. - but for random incoming mail, there's some legit stuff
coming in to us that lacks a PTR record.
For us, the PTR record check is just one of the tests we run. It is weighted
heavily, but it is not decisive by itself.
-Dave Doherty
Skywaves, Inc.
----- Original Message -----
From: "Markus Gufler" <[EMAIL PROTECTED]>
To: <Declude.JunkMail@declude.com>
Sent: Thursday, January 12, 2006 3:38 AM
Subject: RE: [Declude.JunkMail] Sandy's 5xx event sink
... <
With Xwall it would also be possible to block all messages comming from a
host IP without PTR-record. Anyone beside AOL & Co. has already enabled
such
a test? Looking to the results of MDLP from last month I can see that 77%
of
all incomming messages has valid REVDNS records. From the other 23% 20%
seems to be clearly spam and most of the other 3% are in a grey zone who
it's hard to say if it's legit or not. I fear if I enable Envelope
blocking
for sending IP's without REVDNS record this will block some legit messages
send from non-mailservers (web-forms, admin. status messages, ...)
Markus
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