Headers from a typical email with missing reverse DNS:
Received: from UnknownHost [208.94.247.117] by xxxxxx
X-RBL-Warning: REVDNS: This E-mail was sent from a MUA/MTA
208.94.247.117 with no reverse DNS entry.
What is the best way to filter on no reverse DNS?
_____
From: supp...@declude.com [mailto:supp...@declude.com] On Behalf Of Andy
Schmidt
Sent: Monday, February 14, 2011 10:49 AM
To: declude.junkmail@declude.com
Subject: RE: [Declude.JunkMail] Blocking on no REV DNS?
I suppose it depends on your clients. I host mostly small to medium business
sites, bounce on reverse DNS at my gateway and only get a question once or
twice a year, where I assist some clueless Email Admin about contacting his
ISP to set up the proper reverse DNS.
I explain to them that we are in line with AOL, Hotmail, Google and others
that have policies against missing Reverse DNS to show that he may have
FOUND the problem by trying to email US, but that in fact, his emails to
most places on the Internet are being silently deleted, held or flagged as
SPAM - without giving him a warning as WE do.
From: supp...@declude.com [mailto:supp...@declude.com] On Behalf Of Dave
Beckstrom
Sent: Monday, February 14, 2011 9:22 AM
To: declude.junkmail@declude.com
Subject: [Declude.JunkMail] Blocking on no REV DNS?
Years ago it was recommended not to block mail on a missing reverse DNS
because many legitimate mail servers were mis-configured.
We know services like AOL block on missing DNS. Just wondering, do you
block on missing REV DNS? If not, do you at least add weight?
I'm getting to the point where if a mail server doesn't have a reverse DNS
then I'm thinking the heck with them....
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