using System;
public class Program
{
public static void Main()
Console.WriteLine(IsValidEmailAddress("vorname.nachname@gmx.at"));
}
public static bool IsValidEmailAddress(string email)
try
var addr = new System.Net.Mail.MailAddress(email);
return addr.Address == email
&& !email.Contains("ü")
&& !email.Contains("Ü")
&& !email.Contains("ö")
&& !email.Contains("Ö")
&& !email.Contains("ä")
&& !email.Contains("Ä")
&& !email.Contains("ß");
catch (Exception)
return false;