Hi, yesterday due to a user sending a newsletter to a list recipients full of errors (I'm sure about this, I don't know what the message text was) Microsoft started to "temporarily" rate limiting my 2 sending IPs.
The messages are refused with the following log: 451 4.7.650 The mail server [.....] has been temporarily rate limited due to IP reputation. For e-mail delivery information, see https://aka.ms/postmaster (S775) [Name=Protocol Filter Agent][AGT=PFA] I registered to SNDS and found that these IPs turned red yesterday. I opened a ticket and the first automatic reply was that the IPs "do not qualify for mitigation". As requested, I then replied with a detailed email trying to explain the situation but reading previous posts it seems that they won't follow up. So I ask you: - did you have a S775 block in the past and how long was it ? - will I ever receive an answer from MS or my only possibility is checking the logs ? I have a brand new server with another public IP that is part of our AS and listed in SPF. I may route traffic to hotmail via this server but the IP is "cold". I read that someone solved this way but it was not clear if the new Ip was already warmed. Thank you
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