That is a pretty good idea Lowell. I have rolled my own IsValidEmail using regex but I know it is not as robust as the .NET MailAddress object. I have been using my own for a long time and have not yet encountered a legitimate email address that my code failed on but there are most likely a number of things I didn't consider.

In case somebody wants to see an example of using a roll your own regex here is the method I have (this is not a CLR method but the conversion to CLR would be very simple).

public static bool IsValidEmail(string email)

{

Regex re = new Regex(@"^([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$");

return re.IsMatch(email);

}