Outlook cannot connect to GMail server does not support the connection encryption type Solved - Windows 10 Forums
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
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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Outlook cannot connect to GMail server does not support the connection encryption type Solved - Windows 10 Forums
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Outlook 2016 cannot connect to email server with SSL/TLS
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Error: "Unable to send email. The SMTP server requires a secure connection or the client was not authenticated" when sending email with the SMTP method and using your Office 365 account or
SMTP Mail Setup for Secure Connection Failed — mibuso.com
![Email server does not support secure connection [FIXED BY EXPERTS]](https://cdn.windowsreport.com/wp-content/uploads/2019/06/email-server-doesnt-support-secure-connection.jpg "Email server does not support secure connection [FIXED BY EXPERTS]")
Email server does not support secure connection [FIXED BY EXPERTS]
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Enable Opportunistic TLS in IIS SMTP Service - Tutorial
