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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