/// <summary>
/// Send the MAIL FROM command to the server using <paramref name="mailFrom"/> as parameter.
/// </summary>
/// <param name="mailFrom">Email address to use as parameter.</param>
/// <param name="failedCallback">Action to call if command fails.</param>
public async Task <bool> ExecMailFromAsync(MailAddress mailFrom, Action <string> failedCallback)
{
if (!base.Connected)
{
return(false);
}
_LastActive = DateTime.UtcNow;
IsActive = true;
await SmtpStream.WriteLineAsync("MAIL FROM: <" +
(mailFrom == null ? string.Empty : mailFrom.Address) + ">" +
(_DataTransportMime == SmtpTransportMIME._8BitUTF ? " BODY=8BITMIME" : string.Empty));
// If the remote MX doesn't support pipelining then wait and check the response.
if (!_CanPipeline)
{
string response = await SmtpStream.ReadAllLinesAsync();
if (!response.StartsWith("250"))
{
failedCallback(response);
}
}
_LastActive = DateTime.UtcNow;
IsActive = false;
return(true);
}
/// <summary>
/// Send the RCPT TO command to the server using <paramref name="rcptTo"/> as parameter.
/// </summary>
/// <param name="rcptTo">Email address to use as parameter.</param>
/// <param name="failedCallback">Action to call if command fails.</param>
public async Task <bool> ExecRcptToAsync(MailAddress rcptTo, Action <string> failedCallback)
{
if (!base.Connected)
{
return(false);
}
IsActive = true;
_LastActive = DateTime.UtcNow;
await SmtpStream.WriteLineAsync("RCPT TO: <" + rcptTo.Address + ">");
// If the remote MX doesn't support pipelining then wait and check the response.
if (!_CanPipeline)
{
string response = await SmtpStream.ReadAllLinesAsync();
if (!response.StartsWith("250"))
{
failedCallback(response);
}
}
_LastActive = DateTime.UtcNow;
IsActive = false;
return(true);
}
/// <summary>
/// Send the data to the server
/// </summary>
/// <param name="data">Data to send to the server</param>
/// <param name="failedCallback">Action to call if fails to send.</param>
private async Task <MantaOutboundClientSendResult> ExecDataAsync(string data)
{
await SmtpStream.WriteLineAsync("DATA");
string response = await SmtpStream.ReadAllLinesAsync(); // Data response or Mail From if pipelining
// If the remote MX supports pipelining then we need to check the MAIL FROM and RCPT to responses.
if (_CanPipeline)
{
// Check MAIL FROM OK.
if (!response.StartsWith("250"))
{
await SmtpStream.ReadAllLinesAsync(); // RCPT TO
await SmtpStream.ReadAllLinesAsync(); // DATA
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.RejectedByRemoteServer, response, _VirtualMta, _MXRecord));
}
// Check RCPT TO OK.
response = await SmtpStream.ReadAllLinesAsync();
if (!response.StartsWith("250"))
{
await SmtpStream.ReadAllLinesAsync(); // DATA
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.RejectedByRemoteServer, response, _VirtualMta, _MXRecord));
}
// Get the Data Command response.
response = await SmtpStream.ReadAllLinesAsync();
}
if (!response.StartsWith("354"))
{
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.RejectedByRemoteServer, response, _VirtualMta, _MXRecord));
}
// Send the message data using the correct transport MIME
SmtpStream.SetSmtpTransportMIME(_DataTransportMime);
await SmtpStream.WriteAsync(data, false);
await SmtpStream.WriteAsync(MtaParameters.NewLine + "." + MtaParameters.NewLine, false);
// Data done so return to 7-Bit mode.
SmtpStream.SetSmtpTransportMIME(SmtpTransportMIME._7BitASCII);
response = await SmtpStream.ReadAllLinesAsync();
if (!response.StartsWith("250"))
{
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.RejectedByRemoteServer, response, _VirtualMta, _MXRecord));
}
_MessagesAccepted++;
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.Success, response, _VirtualMta, _MXRecord));
}
/// <summary>
/// Say EHLO/HELO to the server.
/// Will also check to see if 8BITMIME is supported.
/// </summary>
/// <param name="failedCallback">Action to call if hello fail.</param>
private async Task <MantaOutboundClientSendResult> ExecHeloAsync()
{
// We have connected to the MX, Say EHLO.
await SmtpStream.WriteLineAsync("EHLO " + _VirtualMta.Hostname);
string response = await SmtpStream.ReadAllLinesAsync();
if (response.StartsWith("421"))
{
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.ServiceNotAvalible, response, _VirtualMta, _MXRecord));
}
try
{
if (!response.StartsWith("2"))
{
// If server didn't respond with a success code on hello then we should retry with HELO
await SmtpStream.WriteLineAsync("HELO " + _VirtualMta.Hostname);
response = await SmtpStream.ReadAllLinesAsync();
if (!response.StartsWith("250"))
{
TcpClient.Close();
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.ServiceNotAvalible, response, _VirtualMta, _MXRecord));
}
}
else
{
// Server responded to EHLO
// Check to see if it supports 8BITMIME
if (response.IndexOf("8BITMIME", StringComparison.OrdinalIgnoreCase) > -1)
{
_DataTransportMime = SmtpTransportMIME._8BitUTF;
}
else
{
_DataTransportMime = SmtpTransportMIME._7BitASCII;
}
// Check to see if the server supports pipelining
_CanPipeline = response.IndexOf("PIPELINING", StringComparison.OrdinalIgnoreCase) > -1;
}
}
catch (IOException)
{
// Remote Endpoint Disconnected Mid HELO.
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.ServiceNotAvalible, response, _VirtualMta, _MXRecord));
}
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.Success, null, _VirtualMta, _MXRecord));
}
/// <summary>
/// Send the RSET command to the server.
/// </summary>
public async Task <bool> ExecRsetAsync()
{
if (!base.Connected)
{
Logging.Debug("Cannot RSET connection has been closed.");
throw new Exception();
}
IsActive = true;
await SmtpStream.WriteLineAsync("RSET");
await SmtpStream.ReadAllLinesAsync();
_LastActive = DateTime.UtcNow;
IsActive = false;
return(true);
}
/// <summary>
/// Send the RCPT TO command to the server using <paramref name="rcptTo"/> as parameter.
/// </summary>
/// <param name="rcptTo">Email address to use as parameter.</param>
/// <param name="failedCallback">Action to call if command fails.</param>
private async Task <MantaOutboundClientSendResult> ExecRcptToAsync(MailAddress rcptTo)
{
await SmtpStream.WriteLineAsync("RCPT TO: <" + rcptTo.Address + ">");
// If the remote MX doesn't support pipelining then wait and check the response.
if (!_CanPipeline)
{
string response = await SmtpStream.ReadAllLinesAsync();
if (!response.StartsWith("250"))
{
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.RejectedByRemoteServer, response, _VirtualMta, _MXRecord));
}
}
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.Success, null, _VirtualMta, _MXRecord));
}
/// <summary>
/// Send the RSET command to the server.
/// </summary>
private async Task <MantaOutboundClientSendResult> ExecRsetAsync()
{
if (!await SmtpStream.WriteLineAsync("RSET"))
{
throw new ObjectDisposedException("Connection");
}
var response = await SmtpStream.ReadAllLinesAsync();
switch (response[0])
{
case '2':
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.Success, response, _VirtualMta, _MXRecord));
case '4':
case '5':
default:
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.RejectedByRemoteServer, response, _VirtualMta, _MXRecord));
}
}
/// <summary>
/// Send the MAIL FROM command to the server using <paramref name="mailFrom"/> as parameter.
/// </summary>
/// <param name="mailFrom">Email address to use as parameter.</param>
/// <param name="failedCallback">Action to call if command fails.</param>
private async Task <MantaOutboundClientSendResult> ExecMailFromAsync(MailAddress mailFrom)
{
await SmtpStream.WriteLineAsync("MAIL FROM: <" +
(mailFrom == null ? string.Empty : mailFrom.Address) + ">" +
(_DataTransportMime == SmtpTransportMIME._8BitUTF ? " BODY=8BITMIME" : string.Empty));
// If the remote MX doesn't support pipelining then wait and check the response.
if (!_CanPipeline)
{
string response = await SmtpStream.ReadAllLinesAsync();
if (!response.StartsWith("250"))
{
if (response.StartsWith("421"))
{
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.ServiceNotAvalible, response, _VirtualMta, _MXRecord));
}
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.RejectedByRemoteServer, response, _VirtualMta, _MXRecord));
}
}
return(new MantaOutboundClientSendResult(MantaOutboundClientResult.Success, null, _VirtualMta, _MXRecord));
}
/// <summary>
/// Say EHLO/HELO to the server.
/// Will also check to see if 8BITMIME is supported.
/// </summary>
/// <param name="failedCallback">Action to call if hello fail.</param>
public async Task <bool> ExecHeloAsync(Action <string> failedCallback)
{
if (!base.Connected)
{
return(false);
}
_LastActive = DateTime.UtcNow;
IsActive = true;
// We have connected to the MX, Say EHLO.
_LastActive = DateTime.UtcNow;
await SmtpStream.WriteLineAsync("EHLO " + MtaIpAddress.Hostname);
string response = await SmtpStream.ReadAllLinesAsync();
if (response.StartsWith("421"))
{
failedCallback(response);
}
_LastActive = DateTime.UtcNow;
try
{
if (!response.StartsWith("2"))
{
// If server didn't respond with a success code on hello then we should retry with HELO
await SmtpStream.WriteLineAsync("HELO " + MtaIpAddress.Hostname);
response = await SmtpStream.ReadAllLinesAsync();
_LastActive = DateTime.UtcNow;
if (!response.StartsWith("250"))
{
failedCallback(response);
base.Close();
}
}
else
{
// Server responded to EHLO
// Check to see if it supports 8BITMIME
if (response.IndexOf("8BITMIME", StringComparison.OrdinalIgnoreCase) > -1)
{
_DataTransportMime = SmtpTransportMIME._8BitUTF;
}
// Check to see if the server supports pipelining
if (response.IndexOf("PIPELINING", StringComparison.OrdinalIgnoreCase) > -1)
{
_CanPipeline = true;
}
}
}
catch (IOException)
{
// Remote Endpoint Disconnected Mid HELO. Most likly Yahoo throttling.
}
_HasHelloed = true;
_LastActive = DateTime.UtcNow;
IsActive = false;
return(true);
}
/// <summary>
/// Send the data to the server
/// </summary>
/// <param name="data">Data to send to the server</param>
/// <param name="failedCallback">Action to call if fails to send.</param>
public async Task <bool> ExecDataAsync(string data, Action <string> failedCallback, Func <string, Task> successCallbackAsync)
{
if (!base.Connected)
{
return(false);
}
_LastActive = DateTime.UtcNow;
IsActive = true;
await SmtpStream.WriteLineAsync("DATA");
string response = await SmtpStream.ReadAllLinesAsync();
// If the remote MX supports pipelining then we need to check the MAIL FROM and RCPT to responses.
if (_CanPipeline)
{
// Check MAIL FROM OK.
if (!response.StartsWith("250"))
{
failedCallback(response);
IsActive = false;
return(false);
}
// Check RCPT TO OK.
response = await SmtpStream.ReadAllLinesAsync();
if (!response.StartsWith("250"))
{
failedCallback(response);
IsActive = false;
return(false);
}
// Get the Data Command response.
response = await SmtpStream.ReadAllLinesAsync();
}
_LastActive = DateTime.UtcNow;
if (!response.StartsWith("354"))
{
failedCallback(response);
IsActive = false;
return(false);
}
// Increment the data commands as server has responded positiely.
_DataCommands++;
// Send the message data using the correct transport MIME
SmtpStream.SetSmtpTransportMIME(_DataTransportMime);
await SmtpStream.WriteAsync(data, false);
await SmtpStream.WriteAsync(MtaParameters.NewLine + "." + MtaParameters.NewLine, false);
_LastActive = DateTime.UtcNow;
// Data done so return to 7-Bit mode.
SmtpStream.SetSmtpTransportMIME(SmtpTransportMIME._7BitASCII);
response = await SmtpStream.ReadAllLinesAsync();
_LastActive = DateTime.UtcNow;
IsActive = false;
if (!response.StartsWith("250"))
{
failedCallback(response);
}
else
{
await successCallbackAsync(response);
}
// If max messages have been sent quit the connection.
if (_DataCommands >= OutboundRuleManager.GetMaxMessagesPerConnection(MXRecord, MtaIpAddress))
{
ExecQuitAsync().Wait();
}
return(true);
}
