Email address validation in C#

Not exacly compatible with iso:

	public static bool ValidateEmailAddress(string email)
	{
	if (email.Length > 254)
	return false;
	else
	{
	string[] emailParts = email.Split(new string[] { "@" }, StringSplitOptions.RemoveEmptyEntries);
	if (emailParts.Length != 2 || email.StartsWith("@") || email.EndsWith("@") || (new Regex("[@]{2,}", RegexOptions.None)).IsMatch(email))
	return false;
	else
	{
	if (emailParts[0].Length <= 64)
	{
	// alias
	Regex rx1 = new Regex(@"^[a-zA-Z0-9_-][a-zA-Z0-9_\.-]*[a-zA-Z0-9_-]$", RegexOptions.None);
	if (emailParts[0].Length > 64 || emailParts[0].Contains("..") || !rx1.IsMatch(emailParts[0]))
	return false;
	}
	else
	return false;
	// domain
	Regex rx2 = new Regex(@"^[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(\.[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*\.[a-zA-Z]{2,63}$", RegexOptions.None);
	if (emailParts[1].Contains("--") || !rx2.IsMatch(emailParts[1]))
	return false;
	}
	}
	return true;
	}

view raw gistfile1.cs hosted with ❤ by GitHub