public static List <MxRecord> MxQuery(string hostName, string nameServer)
{
UdpClient client = new UdpClient(nameServer, (int)Port.Dns);
byte[] data = DNS.CreateQuery(hostName);
IPEndPoint ip = null;
client.Send(data, data.Length);
data = client.Receive(ref ip);
return(GetResponse(data, data.Length));
}
public static List <MxRecord> MxQuery(string hostName)
{
List <MxRecord> records;
if (!_mxRecords.ContainsKey(hostName))
{
records = DNS.MxQuery(hostName, DNS.NameServer);
_mxRecords.Add(hostName, records[0]);
}
records = new List <MxRecord>();
records.Add(_mxRecords[hostName]);
return(records);
}
/// <summary>
/// Validate an e-mail address by checking the mail server
/// </summary>
/// <param name="from"></param>
/// <param name="recipient"></param>
/// <returns></returns>
public Stack <string> Ping(string from, string recipient)
{
if (!Regex.IsMatch(recipient, _pattern))
{
_stack.Push(Result.BadAddressFormat.ToString());
return(_stack);
}
if (_port25blocked)
{
// execute through web service
/*com.vasst.SMTP smtp = new com.vasst.SMTP();
* //Dim smtp As New com.webott.Utility
* object[] response = smtp.Ping(recipient);
* _stack.Clear();
* for (int x = response.Length - 1; x >= 0; x += -1) {
* _stack.Push(response(x));
* }
*/
}
else
{
// execute locally
Result status = Result.Failed;
string domain = this.HostPart(recipient);
if (_testDomain)
{
try {
IPHostEntry host = System.Net.Dns.GetHostEntry(domain);
} catch {
_stack.Push(Result.DomainNotResolved.ToString());
return(_stack);
}
}
List <MxRecord> mxRecords = DNS.MxQuery(domain);
if (mxRecords.Count == 0)
{
// if no records found then try common mail server name
status = Result.NoMxRecords;
mxRecords.Add(MxRecord.Infer(domain));
}
else
{
mxRecords.Sort();
}
for (int x = 0; x <= mxRecords.Count - 1; x++)
{
status = this.WillAccept(mxRecords[x].HostName, from, recipient);
if (status.Contains(Result.MxComplete))
{
break;
}
}
_stack.Push(status.ToString());
}
return(_stack);
}