Dear Faisal,
thanks for the idea. I understand it would be better to send the IP. Next time
I will do this! The IP is 95.216.201.219 for this IP the rDNS has only one
hostname. I now got feedback from Microsoft, that they implemented some
mitigation for this IP and this need 24-48 hours to be replicated. So I hope,
that it will start working in the next days again.
Thanks for your help.
Best, Tobias
--
Tobias Grychtol-Matthaeus
Senior Systemadministrator / IT-Sicherheitsbeauftragter
Informationstechnik
Max-Planck-Institut für Marine Mikrobiologie
Celsiusstr. 1 - D-28359 Bremen
Raum: R1130
Telefon: +49 421 2028-5720
Telefax: +49 421 2028-5658
E-Mail: [email protected]
-----Ursprüngliche Nachricht-----
Von: Faisal Misle via mailop <[email protected]>
Gesendet: Dienstag 20. August 2024 20:54
An: [email protected]
Betreff: Re: [mailop] Strange behavior of the Microsoft Blacklist
It actually has more than one hostname, another poster here mentioned
having issues too. Removing one of the hostnames the rDNS of the IP
points to may fix the issue.
On 8/20/24 5:54 PM, Gellner, Oliver via mailop wrote:
> On 20.08.2024 at 16:40 Tobias Matthaeus via mailop wrote:
>
>> A server that I manage is currently on a Microsoft blocklist for unknown
>> reasons. If you do exactly what Microsoft says in the bounce e-mail:
>> “Forward this error message to [email protected]” then this e-mail also
>> bounces again with “Access denied”. By the way, it's a great idea to apply
>> exactly the same rules to an address where you should report problems.
>> This is of course not very helpful and the SNDS portal only says that you
>> are not on any blocklist. You can also report the case to Microsoft, but
>> then you get back “Rejected because you violate standards”. It is unclear
>> which ones. And when you ask, you end up with the de-escalation team, which
>> doesn't respond within 24 hours. Great thing. And now? Does anyone have any
>> tips for me?
>> said: 550 5.7.511 Access denied, banned sender[]. To request
>> removal from this list please forward this message to [email protected]
>> For more information please go to
>> http://go.microsoft.com/fwlink/?LinkId=526653.
>
> Unfortunately you did not specify the IP address of the affected server. If
> it is the same server your message here was sent from, then you should make
> sure that it has a forward-confirmed reverse DNS, that is the IP address
> 194.95.6.10 of the server should resolve to a name (preferably of a
> organizational domain which has a legitimate looking website with some
> contact details), and this name should resolve back to the IP address. For
> 194.95.6.10 this is not true.
>
> Other than that you might check out Al Iversons blog:
> https://www.spamresource.com/2023/03/never-too-busy-to-talk-about-microsoft.html
>
> --
> BR Oliver
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