[151410] in North American Network Operators' Group
Microsoft/Hotmail forgot to set reverse DNS pointers?
daemon@ATHENA.MIT.EDU (Michiel Klaver)
Wed Mar 21 04:56:02 2012
Date: Wed, 21 Mar 2012 09:54:52 +0100
From: Michiel Klaver <michiel@klaver.it>
To: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Today I received some notices about Hotmail users who couldn't send e-mail
messages to various receipients due to spamfilters blocking them at the
receiving mailservers. Seems like Microsoft/Hotmail staff forgot to set some
reverse DNS pointer records:
Diagnostic-Code: smtp;450 4.7.1 Client host rejected: cannot find your
reverse hostname, [157.55.1.150]
(Verified this using various public DNS servers, to exclude potential local
issues)
Anyone here who has proper contacts to give them the clue-bat?
--
Michiel Klaver
IT Professional
