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A step-by-step guide to send mail using SMTP Auth + OAuth. For years, Basic Authentication has been the quiet workhorse behind countless SMTP integrations — simple, predictable, and admittedly a little outdated. But as Microsoft tightens security across the Microsoft 365 ecosystem, Basic Auth for SMTP is finally reaching its end of life. The message is clear: it’s time to move to OAuth 2.0 . Most admins already know how  to configure OAuth for SMTP. Microsoft’s documentation