Microsoft/Hotmail forgot to set reverse DNS pointers?

[Michiel Klaver <michiel () klaver it>]

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