Cannot send secure mail thru System.Net.Mail.SmtpClient using Outlook365 Mail Server since February - Progress Community
![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](https://i.ytimg.com/vi/7KlQhKfPAVs/sddefault.jpg)
C# : System.Net.Mail.SmtpException: The operation has timed out. error in asp.net send mail code usi - YouTube
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.” ~ Ms.
![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](https://www.aspsnippets.com/Handlers/DownloadFile.ashx?File=1fc80859-f818-4223-9a95-90242984191b.png)
SystemNetMailSmtpException The SMTP server requires a secure connection or the client was not authenticated
![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](https://i.stack.imgur.com/wikq4.png)
c# - SmtpException: Unable to read data from the transport connection: net_io_connectionclosed - Stack Overflow
![สอบถาม เรื่องการส่งEmail เวลาลืมรหัสผ่าน c# โปรแกรมแจ้งว่า An exception of type 'System.Net.Mail.SmtpException' occurred in System.dll but was not handled in user code Additional information: Cannot get IIS pickup directory. สอบถาม เรื่องการส่งEmail เวลาลืมรหัสผ่าน c# โปรแกรมแจ้งว่า An exception of type 'System.Net.Mail.SmtpException' occurred in System.dll but was not handled in user code Additional information: Cannot get IIS pickup directory.](https://www.thaicreate.com/upload/stock/20160716175112.png?v=1001)
สอบถาม เรื่องการส่งEmail เวลาลืมรหัสผ่าน c# โปรแกรมแจ้งว่า An exception of type 'System.Net.Mail.SmtpException' occurred in System.dll but was not handled in user code Additional information: Cannot get IIS pickup directory.
![vb.net - System.Net.Mail.SmtpException The SMTP server requires a secure connection or the client was not authenticated - Stack Overflow vb.net - System.Net.Mail.SmtpException The SMTP server requires a secure connection or the client was not authenticated - Stack Overflow](https://i.stack.imgur.com/41SH5.png)
vb.net - System.Net.Mail.SmtpException The SMTP server requires a secure connection or the client was not authenticated - 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](https://i.stack.imgur.com/goICF.png)
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# - 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](https://i.stack.imgur.com/dNi26.png)
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# - 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](https://i.stack.imgur.com/Rk4va.png)
c# - Gmail Error : System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated - 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](https://i.stack.imgur.com/sTwxC.png)
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
![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](https://www.sharepointdiary.com/wp-content/uploads/2012/01/nintex-error.jpg)
Incoming E-Mails with Attachments Failed - "Message size exceeds fixed maximum message size" - SharePoint Diary
![visual studio - 'The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required - Stack Overflow visual studio - 'The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required - Stack Overflow](https://i.stack.imgur.com/w1ObP.png)
visual studio - 'The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Authentication Required - 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](https://3.bp.blogspot.com/-2j4Ei4x9MGY/VWHECsJ36BI/AAAAAAAABcI/nOqy_aUnVeo/s1600/Gmail_Settings.png)