public bool Send() {
IPAddress dnsServerAddress = GetDnsAddress();
if (dnsServerAddress == null) {
logger.Error("cannot find DNS-Server address!");
return false;
}
string mailDomain = String.Empty;
Match mailDomainMatch = Regex.Match(this.RecipientTo, "@(.+)", RegexOptions.Compiled);
if (mailDomainMatch.Success) {
mailDomain = mailDomainMatch.Groups[1].Value;
} else {
return false;
}
MXRecord[] records = Resolver.MXLookup(mailDomain, dnsServerAddress);
if (records.Length == 0) {
return false;
}
bool result = false;
foreach(MXRecord record in records) {
TcpClient client = new TcpClient(record.DomainName, eMailServer.Options.SmtpPort);
if (!client.Connected) {
continue;
}
SmtpRequestHandler requestHandler = new SmtpRequestHandler(client, eMailServer.Options.SecureSmtpPort, false);
requestHandler.Connected += (object sender, TcpRequestHandler.TcpRequestEventArgs e) => {
if (eMailServer.Options.Verbose) {
logger.Info("Connected to " + e.RemoteEndPoint.Address.ToString() + ":" + e.RemoteEndPoint.Port);
}
};
requestHandler.Disconnected += (object sender, TcpRequestHandler.TcpRequestEventArgs e) => {
if (eMailServer.Options.Verbose) {
logger.Info("Disconnected from " + e.RemoteEndPoint.Address.ToString() + ":" + e.RemoteEndPoint.Port);
}
};
requestHandler.CommandReceived += (object sender, SmtpCommandReceivedEventArgs e) => {
Console.WriteLine("command received => status: " + e.Status + "; message: " + e.Message);
switch(e.Status) {
case 220:
requestHandler.SendMessage(this.MailFromDomain, "EHLO");
break;
case 250:
switch(this._state) {
case TcpRequestHandler.State.MailFromSent:
requestHandler.SendMessage("RCPT TO:<" + this.RecipientTo + ">");
this._state = TcpRequestHandler.State.RecipientToSent;
break;
case TcpRequestHandler.State.RecipientToSent:
requestHandler.SendMessage("DATA");
this._state = TcpRequestHandler.State.Default;
break;
case TcpRequestHandler.State.MessageSent:
requestHandler.SendMessage("QUIT");
requestHandler.Close();
this._state = TcpRequestHandler.State.Default;
break;
case TcpRequestHandler.State.Default:
if (e.Message == "STARTTLS") {
requestHandler.StartTls();
//if (requestHandler.StartTls()) {
//Console.WriteLine("send message Go ahead");
//requestHandler.SendMessage("Go ahead", "220");
//Console.WriteLine("message Go ahead was sent");
//}
}
requestHandler.SendMessage("MAIL FROM:<" + this.MailFrom + ">");
this._state = TcpRequestHandler.State.MailFromSent;
break;
}
break;
case 354: // Start Mail Input
requestHandler.SendMessage("From: <" + this.MailFrom + ">");
requestHandler.SendMessage("To: <" + this.RecipientTo + ">");
requestHandler.SendMessage("Subject: <" + this.Subject + ">");
requestHandler.SendMessage("");
requestHandler.SendMessage(this.Message);
requestHandler.SendMessage(".");
this._state = TcpRequestHandler.State.MessageSent;
break;
case 530: // Authentication required
break;
case 550:
requestHandler.SendMessage("QUIT");
requestHandler.Close();
break;
case 554:
requestHandler.SendMessage("QUIT");
requestHandler.Close();
break;
}
};
requestHandler.Start();
requestHandler.WaitForClosing();
result = true;
break;
}
return result;
}
public bool Send()
{
IPAddress dnsServerAddress = GetDnsAddress();
if (dnsServerAddress == null)
{
logger.Error("cannot find DNS-Server address!");
return(false);
}
string mailDomain = String.Empty;
Match mailDomainMatch = Regex.Match(this.RecipientTo, "@(.+)", RegexOptions.Compiled);
if (mailDomainMatch.Success)
{
mailDomain = mailDomainMatch.Groups[1].Value;
}
else
{
return(false);
}
MXRecord[] records = Resolver.MXLookup(mailDomain, dnsServerAddress);
if (records.Length == 0)
{
return(false);
}
bool result = false;
foreach (MXRecord record in records)
{
TcpClient client = new TcpClient(record.DomainName, eMailServer.Options.SmtpPort);
if (!client.Connected)
{
continue;
}
SmtpRequestHandler requestHandler = new SmtpRequestHandler(client, eMailServer.Options.SecureSmtpPort, false);
requestHandler.Connected += (object sender, TcpRequestHandler.TcpRequestEventArgs e) => {
if (eMailServer.Options.Verbose)
{
logger.Info("Connected to " + e.RemoteEndPoint.Address.ToString() + ":" + e.RemoteEndPoint.Port);
}
};
requestHandler.Disconnected += (object sender, TcpRequestHandler.TcpRequestEventArgs e) => {
if (eMailServer.Options.Verbose)
{
logger.Info("Disconnected from " + e.RemoteEndPoint.Address.ToString() + ":" + e.RemoteEndPoint.Port);
}
};
requestHandler.CommandReceived += (object sender, SmtpCommandReceivedEventArgs e) => {
Console.WriteLine("command received => status: " + e.Status + "; message: " + e.Message);
switch (e.Status)
{
case 220:
requestHandler.SendMessage(this.MailFromDomain, "EHLO");
break;
case 250:
switch (this._state)
{
case TcpRequestHandler.State.MailFromSent:
requestHandler.SendMessage("RCPT TO:<" + this.RecipientTo + ">");
this._state = TcpRequestHandler.State.RecipientToSent;
break;
case TcpRequestHandler.State.RecipientToSent:
requestHandler.SendMessage("DATA");
this._state = TcpRequestHandler.State.Default;
break;
case TcpRequestHandler.State.MessageSent:
requestHandler.SendMessage("QUIT");
requestHandler.Close();
this._state = TcpRequestHandler.State.Default;
break;
case TcpRequestHandler.State.Default:
if (e.Message == "STARTTLS")
{
requestHandler.StartTls();
//if (requestHandler.StartTls()) {
//Console.WriteLine("send message Go ahead");
//requestHandler.SendMessage("Go ahead", "220");
//Console.WriteLine("message Go ahead was sent");
//}
}
requestHandler.SendMessage("MAIL FROM:<" + this.MailFrom + ">");
this._state = TcpRequestHandler.State.MailFromSent;
break;
}
break;
case 354: // Start Mail Input
requestHandler.SendMessage("From: <" + this.MailFrom + ">");
requestHandler.SendMessage("To: <" + this.RecipientTo + ">");
requestHandler.SendMessage("Subject: <" + this.Subject + ">");
requestHandler.SendMessage("");
requestHandler.SendMessage(this.Message);
requestHandler.SendMessage(".");
this._state = TcpRequestHandler.State.MessageSent;
break;
case 530: // Authentication required
break;
case 550:
requestHandler.SendMessage("QUIT");
requestHandler.Close();
break;
case 554:
requestHandler.SendMessage("QUIT");
requestHandler.Close();
break;
}
};
requestHandler.Start();
requestHandler.WaitForClosing();
result = true;
break;
}
return(result);
}