Some users may have some issues in sending mails through M365 Exchange and receive the error “bad sequence of commands”
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They posted some updates
I don’t see the issue the service health status page active or recent anymore, so i guess it’s resolved?
Bleedingcomputer has an article about it: https://www.bleepingcomputer.com/news/microsoft/microsoft-exchange-online-hit-by-new-outage-blocking-emails/