Seems like an MS issue, lots of reports from everywhere with similar errors.
Scott On Friday, 04-09-2026 at 05:31 lukn via mailop wrote: Hello Mailops A few hours ago Microsoft suddenly started to drastically rate limit all our servers with the following message: > 451 4.7.500 Server busy. Please try again later from [x.x.x.x]. (S7 7719) Is anyone else affected? Problem on their or our side? (Downdetector for some European countries hints towards Redmond...) Best regards lukn _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
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