c# - The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required? - Stack Overflow
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c# - The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required? - Stack Overflow
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c# - Gmail Error :The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required - Stack Overflow
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Dynamics On-Premise] Mailbox Error – Server does not support secure connections | Rajeev Pentyala - Microsoft Power Platform
Your server does not support the connection encryption type you have - Microsoft Community
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