MX Record einer Domain mit nslookup ermitteln

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public static String[] GetMxRecordsByDomain(String domain)
{
    ProcessStartInfo start = new ProcessStartInfo("nslookup");
    start.RedirectStandardOutput = true;
    start.UseShellExecute = false;
    start.Arguments = "-type=MX " + domain;

    Process nslookup = Process.Start(start);

    List<String> output = new List<String>();
    List<String> mx = new List<String>();

    while (!nslookup.StandardOutput.EndOfStream)
    {
        output.Add(nslookup.StandardOutput.ReadLine());
        if (output.Last().Contains("mail exchanger = "))
        {
            mx.Add(output.Last().Remove(0, output.Last().IndexOf("mail exchanger = ") + "mail exchanger = ".Length));
        }
    }

    return mx.ToArray();
}