Microsoft/Hotmail forgot to set reverse DNS pointers?

Wed Mar 21 16:38:52 UTC 2012

Mocalert at Microsoft.com

Mention Sev1 in your email. 

ryan

On Mar 21, 2012, at 1:54 AM, Michiel Klaver <michiel at klaver.it> wrote:

> 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
> 