using System;

using System.Net;

​

class Program {

    static void Main(string[] args) {

        string email = "myemail@email.com";

        bool isValid = isValidEmailDomain(email);

        Console.WriteLine($"Is {email} a valid email? {isValid}");

    }

​

    static bool isValidEmailDomain(string email) {

        if (string.IsNullOrWhiteSpace(email)) {

            return false;

        }

​

        string[] parts = email.Split('@');

        if (parts.Length != 2) {

            return false; // email must have exactly one @ symbol

        }

​

        string localPart = parts[0];

        string domainPart = parts[1];

​

        try {

            // check if domain name has a valid MX record

            var hostEntry = Dns.GetHostEntry(domainPart);

            return hostEntry.HostName.Length > 0;

        }

        catch {

            return false; // domain name is invalid or does not have a valid MX record

        }

    }

}

​