![Gmail Error : System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated - Stack Overflow 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)
Gmail Error : System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated - Stack Overflow
![mail.app - Why do I get a 'connection to the outgoing server "smtp.gmail.com" failed' message in iOS Mail? - Ask Different mail.app - Why do I get a 'connection to the outgoing server "smtp.gmail.com" failed' message in iOS Mail? - Ask Different](https://i.stack.imgur.com/HRLuo.jpg)
mail.app - Why do I get a 'connection to the outgoing server "smtp.gmail.com" failed' message in iOS Mail? - Ask Different
![email - Cannot send mail using smtp.gmail.com from ONLY one specific Google account - Stack Overflow email - Cannot send mail using smtp.gmail.com from ONLY one specific Google account - Stack Overflow](https://i.imgur.com/pXQ5fz7.png)
email - Cannot send mail using smtp.gmail.com from ONLY one specific Google account - Stack Overflow
![phpmailer - Getting error while sending email through Gmail SMTP - "Please log in via your web browser and then try again. 534-5.7.14" - Stack Overflow phpmailer - Getting error while sending email through Gmail SMTP - "Please log in via your web browser and then try again. 534-5.7.14" - Stack Overflow](https://i.stack.imgur.com/uqwkd.png)