DnsQueryEx Class

Provides properties and methods for querying MX records of domain from DNS server.

System.Object
    EASendMail.DnsQueryEx

[Visual Basic]
Public Class DnsQueryEx

[C#]
public class DnsQueryEx

[C++]
public __gc class DnsQueryEx

[JScript]
public class DnsQueryEx

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Public Methods

Remarks

Example

[C#] To get the full samples of EASendMail, please refer to Samples section.

[C#]
using System;
using EASendMail;

public void QueryServersAndSendMail()
{
    try
    {
        SmtpServer[] servers = DnsQueryEx.QueryServers("to@adminsystem.com");

        // query MX record (SMTP server addresses) for to@adminsystem.com
        // try to send email with every SMTP server until the email was sent.
        for (int i = 0; i < servers.Length; i++)
        {
            try
            {
                SmtpServer oServer = servers[i];
                SmtpMail oMail = new SmtpMail("TryIt");
                oMail.From = new MailAddress("from@adminsystem.com");
                oMail.To.Add(new MailAddress("to@adminsystem.com"));

                oMail.Subject = "test subject";
                oMail.TextBody = "test body";

                SmtpClient oSmtp = new SmtpClient();
                oSmtp.SendMail(oServer, oMail);

                // Succeeded, break.
                Console.WriteLine("The email has been sent to {0} successfully!", servers[i]);
                break;
            }
            catch (Exception exp)
            {
                Console.WriteLine("Error with server {0} - {1}", servers[i],  exp.Message);
            }
        }
    }
    catch (Exception ep)
    {
        Console.WriteLine(ep.Message);
    }
}

Online Examples

Send Email using MX DNS lookup - VB
Send Email using MX DNS lookup - C#
Send Email using MX DNS lookup - C++/CLI