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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
![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 using your Office 365 account or Gmail 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 using your Office 365 account or Gmail](https://support.na.sage.com/Platform/Publishing/images/CP_CE/1601592157902_image.png)
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 using your Office 365 account or Gmail
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The SMTP server requires a secure connection or the client was not authenticated - Easy fix - StarDevStudio
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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
![powershell - How to fix 'the SMTP server requires a secure connection or the client was not authenticated' error when the server response was 5.7.0? - Stack Overflow powershell - How to fix 'the SMTP server requires a secure connection or the client was not authenticated' error when the server response was 5.7.0? - Stack Overflow](https://i.stack.imgur.com/A9fkI.png)
powershell - How to fix 'the SMTP server requires a secure connection or the client was not authenticated' error when the server response was 5.7.0? - Stack Overflow
![The SMTP server requires a secure connection or the client was not authenticated - Easy fix - StarDevStudio The SMTP server requires a secure connection or the client was not authenticated - Easy fix - StarDevStudio](https://stardevstudio.com/wp-content/uploads/2023/04/image-1.png)
The SMTP server requires a secure connection or the client was not authenticated - Easy fix - StarDevStudio
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SMTP server requires a secure connection or the client was not authenticated | Email Sending ASP.NET - YouTube
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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
![Email Router CRM 2011/2013 Error: “System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first.” - Microsoft Email Router CRM 2011/2013 Error: “System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first.” - Microsoft](http://lh5.ggpht.com/-nhJW75KgFFc/U840Rj0wQ7I/AAAAAAAADGw/NstryqjvFFo/image_thumb%25255B3%25255D.png?imgmax=800)
Email Router CRM 2011/2013 Error: “System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first.” - Microsoft
Jet Reports - The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP...
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The SMTP Server Requires A Secure Connection Or The Client Was Not Authenticated. The Server Response Was: 5.7.1 Client Was Not Authenticated
![c# - The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required - Super User c# - The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required - Super User](https://i.stack.imgur.com/C6E88.png)
c# - The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required - Super User
![The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Authentication required The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Authentication required](https://www.infinetsoft.com/Uploads/20161015033444smtp%20server%20requires%20a%20secure%20connection%205.5%201.png)
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Authentication required
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