Anyone have contact with Microsoft network ops? They've blackholed my SMTP (204.11.50.134) (which is used by me and half a dozen other people, none of whom send spam), and my admin's on vacation and I don't wanna screw up his time off. This is obviously a false positive though.
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@pluralistic go to olcsupport.office.com and log a ticket. They do resolve things. It normally takes two iterations. They say there is nothing wrong with your IP, then if you think there still is, send them error messages. But it does get fixed.
Logs and error messages help.