using System;

using System.Security.Cryptography;

using System.Text;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var salt = "e80eeadb-61a7-4f17-876b-ecd429937739"; // any guid will work as long as it doesn't change

        using (SHA256 mySHA256 = SHA256Managed.Create())

        {

            byte[] hashValue = mySHA256.ComputeHash(Encoding.UTF8.GetBytes("some-email@example.com" + salt));

            Console.WriteLine(ConvertToString(hashValue) + "@ololocal.net");

        }

    }

​

    public static string ConvertToString(byte[] array)

    {

        return string.Join("", array.Select(x => string.Format("{0:X2}", x)));

    }

}