Sending Emails

As far as I know the fasted (as in writing code) method is to use the System.Web.Mail.SMTPMail classes where this generates the fastest possible code execution is an entirely different matter. I have written a SMTP mail class that delivers directly to the mail host for the destination domain but this was to get the return codes from the remote system not to be fast. If your ultimate goal is to send bulk emails then an Ironport box is the solution but it's a huge investment that's only worth while if you can support the bandwidth that it will consume