// GET api/values
public async Task <IHttpActionResult> Get(String Emailaddress)
{
try
{
if (!IsEmailValid(Emailaddress))
{
return(BadRequest("InvalidEmailAddress"));
}
EmailAccountVerificationProcess process = new EmailAccountVerificationProcess();
ValidateAccountResponse Response = process.ValidateAccount(Emailaddress);
return(Ok(new ApiResponse()
{
Result = Response.Result, VerificationResult = Response.VerificationResult, ErrorCode = Response.ErrorCode
}));
}
catch (Exception ex)
{
return(InternalServerError(ex));
}
}
public ValidateAccountResponse ValidateAccount(string EmailAddress)
{
ValidateAccountResponse Result = new ValidateAccountResponse() { Result = true, VerificationResult = false, ErrorCode = "" };
try
{
string receiptTo = EmailAddress;
string command = "nslookup -type=MX ";
string response = "";
String[] arrSplit = receiptTo.Split('@');
string[] mxUrl = null;
string MailExchanger = "mail exchanger =";
string domain = arrSplit[arrSplit.Length-1];
command += domain;
ExecuteCommandSync(command, ref response);
foreach (String line in response.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries))
{
if (line.Contains(domain))
{
string tempUrl = line.IndexOf("mail exchanger =") < 0 ? null : line.Substring(line.IndexOf(MailExchanger) + MailExchanger.Length).Trim();
if (tempUrl != null)
{
if (mxUrl == null)
{
mxUrl = new string[1];
}
else
{
Array.Resize<string>(ref mxUrl, mxUrl.Length + 1);
}
mxUrl[mxUrl.Length - 1] = tempUrl;
}
}
}
//mx servers found if mxUrl!=null
if (mxUrl != null)
{
bool accountFound = false;
for (int i = 0; i < mxUrl.Length; i++)
{
//smtp servers run on either of 25,465,587 ports
TcpClient tClient;
try
{
tClient = new TcpClient(mxUrl[i], 25);
}
catch (Exception ex)
{
try
{
tClient = new TcpClient(mxUrl[i], 465);
}
catch (Exception ex2)
{
tClient = new TcpClient(mxUrl[i], 587);
}
}
string CRLF = "\r\n";
byte[] dataBuffer;
string ResponseString;
NetworkStream netStream = tClient.GetStream();
StreamReader reader = new StreamReader(netStream);
ResponseString = reader.ReadLine();
/* Perform HELO to SMTP Server and get Response */
dataBuffer = BytesFromString("HELO " + domain + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();
dataBuffer = BytesFromString("MAIL FROM:<*****@*****.**>" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();
/* Read Response of the RCPT TO Message to know from SMTP if it exist or not */
dataBuffer = BytesFromString("RCPT TO:<" + receiptTo + ">" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();
if (GetResponseCode(ResponseString) == 250)
{
accountFound = true;
}
/* QUIT CONNECTION */
dataBuffer = BytesFromString("QUIT" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();
tClient.Close();
if (accountFound)
break;
}
Result.VerificationResult= accountFound;
}
else
{
Result.VerificationResult=false;
Result.ErrorCode = "No MX servers Found";
}
}
catch (Exception ex)
{
Result.VerificationResult = false;
Result.Result = false;
Result.ErrorCode = ex.Message;
}
return Result;
}
