Remote Server returned '550 5.7.1 RESOLVER.RST.AuthRequired; authentication= required'
https://learn.microsoft.com/ru-ru/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-7-1-in-exchange-online
https://learn.microsoft.com/ru-ru/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-7-1-in-exchange-online
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