Java

MX Lookup Mail Server Domain by Email Address

How to find the mail server for a given email address. Returns the domain name of the primary mail server. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkDns dns = new CkDns();
    CkJsonObject json = new CkJsonObject();

    String emailAddr = "bob@example.com";

    //  This gets all MX domains for an email address.  (Typically one domain.)
    //  The preferred domain will be at index 0 (see below).
    success = dns.Query("MX",emailAddr,json);
    if (success == false) {
        System.out.println(dns.lastErrorText());
        return;
        }

    int i = 0;
    int count_i = json.SizeOfArray("answer.mx");
    while (i < count_i) {
        json.put_I(i);
        String domain = json.stringOf("answer.mx[i].domain");
        System.out.println(domain);
        i = i+1;
        }
  }
}