Hi, I was wondering if anyone has experienced a similar issue and was able to fix it, or if you have any tips on how to escalate a ticket in Outlook.com. For the past year, our IPs have been getting blocked every 2–3 months by Outlook.com. What happens is:
1) Start getting the error "550 5.7.1 Unfortunately, messages from [x.x.x.x] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors."; 2) Open a ticket at https://olcsupport.office.com/ 3) Receive the first response with "Nothing was detected to prevent your mail from reaching Outlook.com customers." 4) Send the error message and ask them to investigate. 5) Finally receive the message "We have implemented mitigation for your IP (x.x.x.x) and this process may take 24 - 48 hours to replicate completely throughout our system." 6) Wait 2-3 months and start over Asking them to escalate the request or for more information leads to nowhere since they always respond with "I do apologize, but I am unable to provide any details about this situation since we do not have the liberty to discuss the nature of the block.". Some additional information: - DKIM, SPF, DMARC are correctly configured. - JMPR is working. Very low number of spam reports as we mainly send invoices, orders confirmation and order delivery updates for different companies. - We have no issues with other providers: not listed in any RBLs, in gmail.com all the IPs have high reputation, etc. Since we manage hundreds of IPs, at some point we even had to create a bot to submit/respond to the tickets automatically with ChatGPT. It works fine but since the mitigation takes 24-48 hours, we have to temporarily rotate the IPs so that messages are delivered. Thanks, Fernando
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