![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 - Using Gmail - SQL Authority with Pinal Dave 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 - Using Gmail - SQL Authority with Pinal Dave](https://blog.sqlauthority.com/i/d/gmail-dbmail-01.jpg)
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 - Using Gmail - SQL Authority with Pinal Dave
![Send Email using Gmail/G Suite OAUTH/XOAUTH2 with Google Service Account in C#, VB.NET, ASP.NET, C++/CLI - Example Code - SMTP Component - Gmail SMTP OAUTH/XOAUTH2 Send Email using Gmail/G Suite OAUTH/XOAUTH2 with Google Service Account in C#, VB.NET, ASP.NET, C++/CLI - Example Code - SMTP Component - Gmail SMTP OAUTH/XOAUTH2](https://www.emailarchitect.net/easendmail/sdk/html/new_project.png)
Send Email using Gmail/G Suite OAUTH/XOAUTH2 with Google Service Account in C#, VB.NET, ASP.NET, C++/CLI - Example Code - SMTP Component - Gmail SMTP OAUTH/XOAUTH2
![Configuring an SMTP mail server to send notifications | Administering Jira applications Data Center and Server 9.9 | Atlassian Documentation Configuring an SMTP mail server to send notifications | Administering Jira applications Data Center and Server 9.9 | Atlassian Documentation](https://confluence.atlassian.com/adminjiraserver/files/947184044/1167696196/1/1662727343070/add_smtp_mail_server.png)
Configuring an SMTP mail server to send notifications | Administering Jira applications Data Center and Server 9.9 | Atlassian Documentation
![Authentication error while sending emails with Gmail SMTP server in CakePHP 4 - Need Help - Cake Software Foundation, Inc. Authentication error while sending emails with Gmail SMTP server in CakePHP 4 - Need Help - Cake Software Foundation, Inc.](https://global.discourse-cdn.com/standard17/uploads/cakephp/original/2X/a/a3a182fbd58976692c6723fea39493d35bcf7879.png)
Authentication error while sending emails with Gmail SMTP server in CakePHP 4 - Need Help - Cake Software Foundation, Inc.
![HELP!!! How do I solve error code 550 - "Please turn on SMTP Authentication in your mail client" - Google Workspace Admin Community HELP!!! How do I solve error code 550 - "Please turn on SMTP Authentication in your mail client" - Google Workspace Admin Community](https://storage.googleapis.com/support-forums-api/attachment/thread-149719469-8742768421719499705.png)