c# - How to check if the mail has been sent successfully

Question

I am developing an Asp.Net application, where I am sending a mail to the user's email address, if he forgets the password.

I want to check if the mail has been sent sucessfully or not. Is there any method to know that for sure.

EDIT

In case if an email id does'nt exists, then would I detect a failure.

Answer 1

if your SmtpMail.Send(message) method returns no error, it means the email was sent to the SMTP server, then you are out of your jurisdiction, that is how far you can know.