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
Getting this error message: The message could not be sent because the connection to Outgoing server (SMTP) smtp.gmail.com was lost in the middle of | Thunderbird Support Forum | Mozilla Support
Resolved] Failed to connect to server: connection refused (111) error on WordPress | Web Hosting Forum - Review - Community & Resources
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![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")
SOLVED] SMTP Server Requires A Secure Connection Error ... - MS Exchange
SQL SERVER - Database Mail Error: The SMTP Server Requires a Secure Connection or the Client was not Authenticated. The Server Response Was: 5.5.1 - SQL Authority with Pinal Dave
Troubleshooting - Mailtrap Knowledge Base
