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Fix: 421 cannot connect to SMTP Server - Appuals.com
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The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at « Asp.Net,MVC,C#.Net,VB.Net,Windows Application,WPF,Javascript,jQuery,HTML,Tips and Tricks,GridView
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failure sending mail: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL
Test SMTP connection and send test email
![SOLVED] SMTP Server Requires A Secure Connection Error ... - MS Exchange](https://content.spiceworksstatic.com/service.community/p/post_images/0000051193/544fad3a/attached_image/10-28-2014_9-48-29_AM.png "SOLVED] SMTP Server Requires A Secure Connection Error ... - MS Exchange")