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Exchange SMTP Auth Fails with: 451 4.7.0 Temporary server error. Please try again later. PRX5
Office 365 refuses SMTP authentication with error: 451 4.7.0 Temporary server error. Please try again later. PRX5 This is when accessing External Send SMTP AUTH through OAUTH2 authentication. Initia...
Hello, I apologize for any confusion my response may have caused. After reviewing your feedback, I have determined that the Windows patch is unlikely to be directly related to this issue. Once again, I apologize for any confusion my response may have caused.