static async Task<EmailInfo> CheckEmailAddresses(
string email,
string mxHostAddress,
int port,
ProgressBar pbar
)
{
pbar.Tick($"Currently processing: #{pbar.CurrentTick} emails searched...");
var mailInfo = new EmailInfo
{
Email = email,
ProviderExists = false,
EmailResolution = EmailResolutionType.CantDetemine
};
try
{
if (!string.IsNullOrEmpty(mxHostAddress) && !string.IsNullOrEmpty(email))
{
using (var telnetClient = new Client(
mxHostAddress,
port,
CancellationToken.None
))
{
if (mailInfo.ProviderExists = telnetClient.IsConnected)
{
mailInfo.Email = email;
await telnetClient.Write("HELO localhost\r\n");
await telnetClient.ReadAsync(new TimeSpan(0, 0, 10));
await telnetClient.Write("MAIL FROM:<*****@*****.**>\r\n");
await telnetClient.ReadAsync(new TimeSpan(0, 0, 10));
await telnetClient.Write(
string.Format("RCPT TO:<{0}>\r\n", email)
);
var response = await telnetClient.ReadAsync(new TimeSpan(0, 1, 0));
if (response.StartsWith("2"))
mailInfo.EmailResolution = EmailResolutionType.Exist;
else if (response.StartsWith("5") && response.Contains("exist"))
mailInfo.EmailResolution = EmailResolutionType.NotExist;
else
mailInfo.EmailResolution = EmailResolutionType.CantDetemine;
}
await telnetClient.Write("QUIT");
}
}
}
catch (Exception ex)
{
_log.Error(string.Empty, ex);
}
return mailInfo;
}
public static void SendMessage()
{
using (var client = new Client ("192.168.123.111", 10000, new System.Threading.CancellationToken ())) {
if (client.IsConnected) {
var s = new StringBuilder ();
s.Append ("Datum: " + DateTime.Now.ToShortDateString () + "\n");
s.Append ("Uhrzeit: " + DateTime.Now.ToLongTimeString () + "\n");
s.Append ("Status: " + "EIN" + "\n");
s.Append ("Meldung: " + "Ich bin eine einfache Meldung" + "\n");
s.Append ("55A2A7A9");
client.Write (s.ToString ());
}
}
}