[Solved] Smtp authentification required [duplicate]
You need to tell the SMTP client that you will not be using your windows credentials to access the SMTP, so add smtpClient.UseDefaultCredentials = false; above this line of code smtpClient.Credentials = new NetworkCredential(“[email protected]”, “password”); Also, gmail doesn’t allow impersonation, so mailMessage.From = new MailAddress(“[email protected]”); will have no effect – the emails will still appear … Read more