Hi, On Apr 06 we detected that 28 IPs were blocked in Outlook.com, all with the following error:
550 5.7.1 Unfortunately, messages from [185.103.9.41] 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. Although some of the blocked IPs were new, most of them were in use by the same customers for years without issues. Part of them didn't had a single spam report or spam trap hit in the last 3-6 months. After making sure that these servers weren't compromised, I opened tickets at https://olcsupport.office.com/ and, after escalation, the response was that the IPs didn't qualify for mitigation at this time or that there were "changes in email sending volume" ( there weren't, the volume hasn't changed since we have limits for each IP/customer to avoid these issues ) Today I noticed that the data on Apr 06 in missing in SNDS. All other dates are showing up, just Apr 06 is missing. I was wondering if anyone else experienced similar issues on Apr 06 with missing data on SNDS or a high number of IPs getting blocked? Thanks.
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