Attempting to send emails through Gmail's SMTP servers returns "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required"


If you're tying to send emails through Gmail's SMTP servers you may see an error similar to the following



The following error is generated by .NET's SMTP client class.

System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at
   at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response)
   at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, MailAddress from, Boolean allowUnicode)
   at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, Boolean allowUnicode, SmtpFailedRecipientException& exception)
   at System.Net.Mail.SmtpClient.Send(MailMessage message)


For this to work you will need to login to your Gmail account and set the following setting


Allow less secure apps: ON
Some apps and devices use less secure sign-in technology, which could leave your account vulnerable. You can turn off access for these apps (which we recommend) or choose to use them despite the risks.
 







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