/// <summary>
/// Parse an Smtp response text into SmtpReply
/// </summary>
/// <param name="textReply">Smtp response text</param>
/// <returns>SmtpReply parsed from text</returns>
public static SmtpReply Parse(string textReply)
{
SmtpReply smtpReply = new SmtpReply();
// extract reply code (first 3 digits)
smtpReply.ReplyCode = (SmtpReplyCode)Convert.ToInt32(textReply.Substring(0, SmtpReply.REPLY_CODE_LENGTH));
// extract the text after reply code
smtpReply.Text = textReply.Substring(3, textReply.IndexOf(SmtpReply.CRLF) - 3).Trim();
return(smtpReply);
}
/// <summary>
/// Send an email message
/// </summary>
/// <param name="emailMessage">Email message to send</param>
public void Send(EmailMessage emailMessage)
{
try
{
// get Smtp server Ip address
IPHostEntry smtpServerHostEntry = Dns.GetHostEntry(this.smtpServer.Host);
// create socket to connect to the Smtp server
this.socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
this.socket.Connect(new IPEndPoint(smtpServerHostEntry.AddressList[0], this.smtpServer.Port));
}
catch (Exception ex)
{
throw new SmtpCommunicationException(ex);
}
SmtpReply smtpResponse;
SmtpCommand smtpCommand;
smtpResponse = SmtpReply.Parse(this.GetResponse());
if (smtpResponse.ReplyCode != SmtpReplyCode.DomainServiceReady)
{
throw new SmtpException(smtpResponse.ReplyCode);
}
// HELO command
smtpCommand = new SmtpCommand();
smtpCommand.CommandCode = SmtpCommandCode.HELO;
smtpCommand.Text = this.clientHostName;
this.SendCommand(smtpCommand);
smtpResponse = SmtpReply.Parse(this.GetResponse());
if (smtpResponse.ReplyCode != SmtpReplyCode.RequestedMailActionOk)
{
throw new SmtpException(smtpResponse.ReplyCode);
}
// FROM command
smtpCommand.CommandCode = SmtpCommandCode.MAIL;
smtpCommand.Text = "FROM:<" + emailMessage.From + ">";
this.SendCommand(smtpCommand);
smtpResponse = SmtpReply.Parse(this.GetResponse());
if (smtpResponse.ReplyCode != SmtpReplyCode.RequestedMailActionOk)
{
throw new SmtpException(smtpResponse.ReplyCode);
}
// TO command, for all recipients
foreach (string rcpt in emailMessage.To)
{
smtpCommand.CommandCode = SmtpCommandCode.RCPT;
smtpCommand.Text = "TO:<" + rcpt + ">";
this.SendCommand(smtpCommand);
smtpResponse = SmtpReply.Parse(this.GetResponse());
if (smtpResponse.ReplyCode != SmtpReplyCode.RequestedMailActionOk)
{
throw new SmtpException(smtpResponse.ReplyCode);
}
}
// DATA command
smtpCommand.CommandCode = SmtpCommandCode.DATA;
smtpCommand.Text = String.Empty;
this.SendCommand(smtpCommand);
smtpResponse = SmtpReply.Parse(this.GetResponse());
if (smtpResponse.ReplyCode != SmtpReplyCode.StartMailInput)
{
throw new SmtpException(smtpResponse.ReplyCode);
}
// mail text
this.SendRawData(emailMessage.ToString());
smtpResponse = SmtpReply.Parse(this.GetResponse());
if (smtpResponse.ReplyCode != SmtpReplyCode.RequestedMailActionOk)
{
throw new SmtpException(smtpResponse.ReplyCode);
}
// QUIT command
smtpCommand.CommandCode = SmtpCommandCode.QUIT;
smtpCommand.Text = String.Empty;
this.SendCommand(smtpCommand);
smtpResponse = SmtpReply.Parse(this.GetResponse());
if (smtpResponse.ReplyCode != SmtpReplyCode.DomainServiceClosingTransmissionChannel)
{
throw new SmtpException(smtpResponse.ReplyCode);
}
this.socket.Close();
}