Regarding this post about email verification,
using C#, how would you
- issue a VRFY command
- issue a RCPT command
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IMO, RCPT method is the best one, and I still use it everyday.
Here are the necessary code : http://mailsystem.codeplex.com/SourceControl/changeset/view/51422#541825
The class is quite heavy, you will have to pick the code snippet you need from the source code.