I have a C.2008 web application that has a 'sign-up' page for an e-mail subscription program.
After you submit, it sends us an to the user who just specified an e-mail address for further verification.
The annoying thing is there are bots out there that fill out the forms with invalid data, and submit the form. So the e-mail is still attempted to be sent, but if it fails, the undeliverable is sent back to us. That is when we see that its a fictictious e-mail.
What is the new and recommended .NET 2008 way to resolve this?