While it may not be good as a single test, remember that AOL bounces ALL
messages without reverse DNS.
When one of our bandwidth providers screwed up our reverse DNS allocation,
AOL immediately stopped accepting all e-mail from us because our
IN-ADDR.ARPA records were no longer available. Once we got the bandwidth
provider to re-allocate our REVERSE DNS, AOL immediately started to accept
our messages again.
For more information on , see:
http://postmaster.aol.com/guidelines/standards.html.
While AOL's connection message, sent to the mail server as mail transmission
to AOL is negotiated states: "America Online (AOL) and its affiliated
companies do not authorize the use of its proprietary computers and computer
networks to accept, transmit, or distribute unsolicited bulk e-mail sent
from the internet. Effective immediately: AOL may no longer accept
connections from IP addresses which have no reverse-DNS (PTR record)
assigned."
The link http://postmaster.aol.com/guidelines/standards.html, in line 4 of
the served page, now clearly states: "AOL's mail servers will reject
connections from any IP address that does not have reverse DNS (a PTR
record)."
Considering that one post I saw stated that AOL was rejecting something like
eight billion messages per day (please don't attack the quoted number as it
may or may not be accurate), based on no reverse DNS entry, that pretty much
makes it a "de-facto standard" If they are doing it, then it's going to be
pretty hard for others to ignore it.
Once we implemented immediate rejection for no reverse DNS entry - two years
ago now, we saw our spam drop by almost 50% and have not had one single
complaint since doing so. Remember, too, that for anyone to have a reverse
DNS entry also requires allocation of the subnet you are using to the
primary domain name of your mail server. It CAN be done. Sometimes it
takes some work, but it CAN be done. There are several posts in the archive
about this very issue.
Bruce Barnes
ChicagoNetTech Inc
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of John T (Lists)
Sent: Friday, December 16, 2005 19:33
To: [email protected]
Subject: RE: [IMail Forum] Reverse-DNS-Check
It is a good test as part of a weighting system.
However, to take action on one test is not so wise.
John T
eServices For You
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:IMail_Forum-
[EMAIL PROTECTED]] On Behalf Of Martin Schaible
Sent: Friday, December 16, 2005 5:16 PM
To: Ipswitch IMail Mailing List
Subject: [IMail Forum] Reverse-DNS-Check
Hi,
We do not use the reverse dns check for a spam check. I'm not sure, if
the
time is
right to switch it on. In earlier days, this check was to dangerous.
Do you use the reverse dns check?
--
Mit freundlichen Grüssen
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Merlin Consulting
Martin Schaible
Bahnhofstrasse 27
CH-8702 Zollikon
Phone: +41 44 391 30 00
Fax: +41 44 391 32 49
Mail: mailto:[EMAIL PROTECTED]
URL: http://www.merlinconsulting.ch
Support: http://support.merlinconsulting.ch
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