With Microsoft.NET Framework 2.0 everything is asynchronous and we can send mail also asynchronously. This features is very useful when you send lots of bulk mails like news letter. You don’t have to wait for response from mail server and you can do other task . Let's create a simple example to send mail. For sending mail asynchronously you need to create a event handler that will notify that mail successfully sent or some errors occurred during sending mail. Let’s create a mail object and then we will send it asynchronously. You will require System.Net.Mail space to import in your page to send mail.