public static string[] GetMXRecords(string domain)
{
IntPtr ptr1 = IntPtr.Zero;
IntPtr ptr2 = IntPtr.Zero;
MXRecord recMx;
if (Environment.OSVersion.Platform != PlatformID.Win32NT)
{
throw new NotSupportedException();
}
ArrayList list1 = new ArrayList();
int num1 = DnsLookUp.DnsQuery(ref domain, QueryTypes.DNS_TYPE_MX, QueryOptions.DNS_QUERY_BYPASS_CACHE, 0, ref ptr1, 0);
if (num1 != 0)
{
throw new Win32Exception(num1);
}
for (ptr2 = ptr1; !ptr2.Equals(IntPtr.Zero); ptr2 = recMx.pNext)
{
recMx = (MXRecord)Marshal.PtrToStructure(ptr2, typeof(MXRecord));
if (recMx.wType == 15)
{
string text1 = Marshal.PtrToStringAuto(recMx.pNameExchange);
list1.Add(text1);
}
}
DnsLookUp.DnsRecordListFree(ptr1, 0);
return((string[])list1.ToArray(typeof(string)));
}
public static void sendMail(string toAddress, string subject, string message)
{
MailAddress From = new MailAddress("Dungeon Teller <dungeon-teller@localhost>");
MailAddress To = new MailAddress(toAddress);
MailMessage msg = new MailMessage(From, To);
msg.Subject = subject;
msg.Body = message;
try
{
string address = To.ToString();
string domain = address.Substring(address.IndexOf('@') + 1);
string mxRecord = DnsLookUp.GetMXRecords(domain)[0];
SmtpClient client = new SmtpClient(mxRecord);
client.SendAsync(msg, "message1");
}
catch (Exception ex)
{
MessageBox.Show(String.Format("Failed to send email with the following error:\n'{0}'", ex.Message), "Mail-Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}