Office 365 SMTP - 535 5.7.3 Authentication unsuccessful

20

The latest version (20.9.66) is no longer using .NET Framework on Windows or Mono on Linux/Mac.

Manager has been ported to .NET Core. As a side-effect, if there was an issue with TLS 1.2, it should be resolved now in the latest version.

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Ubuntu Server update breaks after 20.9.63