Function to validate e-mail address

does anyone have a funciton or Stored PRoc to validate internet e-mail addresses?

I have a table of e-mail addresses, many of which are junk (the web programmer did not enforce validation on the survey form) and now i have to filter the junk out of the list.

Can any one help with this? Is there a UDF or SP floating out there I could use?These links may give you some ideas:

One that does it in the database

One that does it in C#