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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
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

Error System.Net.Mail.SmtpException: The operation has timed out
Error System.Net.Mail.SmtpException: The operation has timed out

asp.net - Server does not support secure connections in C# - Stack Overflow
asp.net - Server does not support secure connections in C# - Stack Overflow

SMTP Server: Authentication the Server Response was 5.5.1 Authentication required in gmail - .Net Core | MVC | HTML Agility Pack | SQL | Technology Crowds
SMTP Server: Authentication the Server Response was 5.5.1 Authentication required in gmail - .Net Core | MVC | HTML Agility Pack | SQL | Technology Crowds

c# - Error Failure sending mail with smtpexception - Stack Overflow
c# - Error Failure sending mail with smtpexception - Stack Overflow

Error System.Net.Mail.SmtpException: The operation has timed out
Error System.Net.Mail.SmtpException: The operation has timed out

C# : System.Net.Mail.SmtpException: The operation has timed out. error in asp.net send mail code usi - YouTube
C# : System.Net.Mail.SmtpException: The operation has timed out. error in asp.net send mail code usi - YouTube

c# - SmtpException: Unable to read data from the transport connection: net_io_connectionclosed - Stack Overflow
c# - SmtpException: Unable to read data from the transport connection: net_io_connectionclosed - Stack Overflow

c# - SSIS script task failing to send email SMTPexception:System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed - Stack Overflow
c# - SSIS script task failing to send email SMTPexception:System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed - Stack Overflow

The SMTP server authentication error in C# email Sending. - YouTube
The SMTP server authentication error in C# email Sending. - YouTube

c# - System.Net.Mail.SmtpException: 'The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Auth - Stack Overflow
c# - System.Net.Mail.SmtpException: 'The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Auth - Stack Overflow

Server does not support secure connections - deBUG.to
Server does not support secure connections - deBUG.to

Solved: [ERROR] Sending email on labview (Gmail) - NI Community
Solved: [ERROR] Sending email on labview (Gmail) - NI Community

Incoming E-Mails with Attachments Failed - "Message size exceeds fixed maximum message size" - SharePoint Diary
Incoming E-Mails with Attachments Failed - "Message size exceeds fixed maximum message size" - SharePoint Diary

SystemNetMailSmtpException The SMTP server requires a secure connection or the client was not authenticated
SystemNetMailSmtpException The SMTP server requires a secure connection or the client was not authenticated

c# - Sending email through SMTP fails : MailBox name not allowed - Stack Overflow
c# - Sending email through SMTP fails : MailBox name not allowed - Stack Overflow

c# - System.Net.Mail.SmtpException: 'The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Auth - Stack Overflow
c# - System.Net.Mail.SmtpException: 'The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Auth - Stack Overflow

Cannot send secure mail thru System.Net.Mail.SmtpClient using Outlook365 Mail Server since February - Progress Community
Cannot send secure mail thru System.Net.Mail.SmtpClient using Outlook365 Mail Server since February - Progress Community

System.Net.Mail.SmtpException #734 | Support Center
System.Net.Mail.SmtpException #734 | Support Center

VS 2013 [RESOLVED] help sending email via vb.net-VBForums
VS 2013 [RESOLVED] help sending email via vb.net-VBForums

System.Net.Mail.SmtpException error-VBForums
System.Net.Mail.SmtpException error-VBForums

c# - Gmail Error : System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated - Stack Overflow
c# - Gmail Error : System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated - Stack Overflow

SMTP Email Error 54 - Page 3 - NI Community
SMTP Email Error 54 - Page 3 - NI Community