private void Send_Click(object sender, EventArgs e)
{
if (this.CheckInputValidation(SmtpServer.Text, SmtpPort.Text, UserName.Text, Password.Text, From.Text, To.Text,Cc.Text,Bcc.Text))
{
if (this.EmailValidation(this.From.Text))
{
bool isRecipient = false;
if (this.To.Text.Length > 0)
{
if (this.RecipientsEmailValidation(this.To.Text))
{
isRecipient = true;
}
else
{
MessageBox.Show(this, "Recipients' email address is not in the correct format, in \"To: \" field.", "Email Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
}
if (this.Cc.Text.Length > 0)
{
if (!(this.RecipientsEmailValidation(this.Cc.Text)))
{
MessageBox.Show(this, "Recipients' email address is not in the correct format, in \"Cc: \" field.", "Email Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
else
{
isRecipient = true;
}
}
if (this.Bcc.Text.Length > 0)
{
if (!(this.RecipientsEmailValidation(this.Bcc.Text)))
{
MessageBox.Show(this, "Recipients' email address is not in the correct format, in \"Bcc: \" field.", "Email Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
else
{
isRecipient = true;
}
}
if (Internet.IsConnectedToInternet())
{
if (isRecipient == true)
{
Rtf2Html rtf = new Rtf2Html();
string Html = rtf.ConvertRtfToHtml(this.MailMessage);
MailMessage mail_message = new MailMessage();
mail_message.From = this.From.Text;
mail_message.To = this.To.Text;
mail_message.CC = this.Cc.Text;
mail_message.BCC = this.Bcc.Text;
mail_message.Subject = this.Subject.Text;
mail_message.MailType = MailEncodingType.HTML;
mail_message.MailPriority = MailSendPriority.NORMAL;
mail_message.Message = Html;
mail_message.Attachments = this.attachments;
Thread thread = new Thread(new ParameterizedThreadStart(this.SendEmail));
thread.Start(mail_message);
}
else
{
return;
}
}
else
{
MessageBox.Show(this, "You must connect to the internet.", "Email Client", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
else
{
MessageBox.Show(this, "Sender email address is not in the correct format.", "Email Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
//Methods
public void SendMail(MailMessage mailMessage)
{
this.mailMessage = mailMessage;
this.tcp_Socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPAddress[] ip_Addresses;
try
{
ip_Addresses = Dns.GetHostAddresses(this.smtpServer);
}
catch (Exception)
{
this.errorMessage = "Smtp server \"" + this.smtpServer + "\" does not exist.";
throw new SmtpClientException(this.errorMessage);
}
IPEndPoint remote_EndPoint = new IPEndPoint(ip_Addresses[0], this.SmtpPort);
//Raise Connection Establishing Event
this.RaiseConnectionEstablishing(this.smtpServer, this.smtpPort);
try
{
tcp_Socket.Connect((EndPoint)remote_EndPoint);
}
catch
{
this.errorMessage = "Unable to connect to SMTP server: " + this.smtpServer + ",on port " + this.smtpPort + ".";
throw new SmtpClientException(this.errorMessage);
}
this.networkStream = new NetworkStream(this.tcp_Socket);
byte[] buffer;
string responseText = "";
string[] commands = new string[] { "EHLO", "MAIL FROM:", "RCPT TO:", "DATA", "", "QUIT" };
string[] responses = new string[] {"250","250","250","354","250","221"};
string message = "";
bool flag = false;
ASCIIEncoding encoding = new ASCIIEncoding();
if (this.WaitForResponse("220",ref responseText,true) == false)
{
this.errorMessage = "Did not get welcome message from SMTP server: " + this.smtpServer +".\r\nServer said: " + responseText;
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
else
{
//Raise Connection Established Event
this.RaiseConnectionEstablished(this.smtpServer, this.smtpPort);
for (int i = 0; i < commands.Length; i++)
{
message = commands[i];
switch (i)
{
case 0:
message += " " + Dns.GetHostEntry("127.0.0.1").HostName + "\r\n";
break;
case 1:
message += "<" + this.mailMessage.From + ">\r\n";
break;
case 2:
flag = true;
break;
case 3:
message += "\r\n";
break;
case 4:
message += this.GetEmailInformation();
break;
case 5:
message += "\r\n";
break;
}
if (flag == true)
{
string recipientAddress = "";
if (this.mailMessage.To.Length > 0)
{
string[] split = this.mailMessage.To.Split(new char[]{',',';'});
for (int j = 0; j < split.Length; j++)
{
if (split[j].Trim() != "")
{
recipientAddress = "<" + split[j] + ">";
message = "RCPT TO: " + recipientAddress + "\r\n";
this.SendDataThroughSecureStream(message);
if (this.WaitForResponse("250", ref responseText, false) == false)
{
this.errorMessage = "Server rejected the email address: " + recipientAddress + ".";
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
}
}
}
if (this.mailMessage.CC.Length > 0)
{
string[] split = this.mailMessage.CC.Split(new char[] { ',', ';' });
for (int j = 0; j < split.Length; j++)
{
recipientAddress = "<" + split[j] + ">";
message = "RCPT TO: " + recipientAddress + "\r\n";
this.SendDataThroughSecureStream(message);
if (this.WaitForResponse("250", ref responseText, false) == false)
{
this.errorMessage = "Server rejected the email address: " + recipientAddress + ".";
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
}
}
if (this.mailMessage.BCC.Length > 0)
{
string[] split = this.mailMessage.BCC.Split(new char[] { ',', ';' });
for (int j = 0; j < split.Length; j++)
{
recipientAddress = "<" + split[j] + ">";
message = "RCPT TO: " + recipientAddress + "\r\n";
this.SendDataThroughSecureStream(message);
if (this.WaitForResponse("250", ref responseText, false) == false)
{
this.errorMessage = "Server rejected the email address: " + recipientAddress + ".";
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
}
}
flag = false;
}
else
{
if (i == 0)
{
this.SendDataThroughNetworkStream(message);
if (this.WaitForResponse(responses[0], ref responseText, true) == false)
{
this.errorMessage = "Did not get " + responses[0] + " reply from server for command " + commands[0] + ".\r\nServer said: " + responseText;
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
else
{
message = "STARTTLS\r\n";
this.SendDataThroughNetworkStream(message);
if (this.WaitForResponse("220", ref responseText, true) == false)
{
this.errorMessage = "Did not get " + "220" + " reply from server for command " + "STARTTLS" + ".\r\nServer said: " + responseText;
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
else
{
this.secureStream = new SslStream(this.networkStream, true, new RemoteCertificateValidationCallback(OnCertificateValidation));
this.secureStream.AuthenticateAsClient("localhost");
if (this.secureStream.IsAuthenticated)
{
message = "Ehlo " + Dns.GetHostEntry("127.0.0.1").HostName + "\r\n";
this.SendDataThroughSecureStream(message);
if (this.WaitForResponse(responses[0], ref responseText, false) == false)
{
this.errorMessage = "Did not get " + responses[0] + " reply from server for command " + commands[0] + ".\r\nServer said: " + responseText;
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
else
{
if (responseText.IndexOf("Auth Login", StringComparison.OrdinalIgnoreCase) >= 0)
{
message = "Auth Login" + "\r\n";
this.SendDataThroughSecureStream(message);
if (this.WaitForResponse("334", ref responseText, false) == false)
{
this.errorMessage = "Did not get 334 reply from server for AUTH LOGIN" + ".\r\nServer said: " + responseText;
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
else
{
buffer = encoding.GetBytes(this.userName); // Not include Domain Name
message = Convert.ToBase64String(buffer) + "\r\n";
//Raise Authentication Began Event
this.RaiseAuthenticationBegan(this.userName);
this.SendDataThroughSecureStream(message);
if (this.WaitForResponse("334", ref responseText, false) == false)
{
this.errorMessage = "Did not get 334 reply from server for UserName Confirmation" + ".\r\nServer said: " + responseText;
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
else
{
buffer = encoding.GetBytes(this.password);
message = Convert.ToBase64String(buffer) + "\r\n";
this.SendDataThroughSecureStream(message);
if (this.WaitForResponse("235", ref responseText, false) == false)
{
this.errorMessage = "Did not get 235 reply from server for Password Confirmation" + ".\r\nServer said: " + responseText;
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
else
{
//Raise Authentication Finished Event
this.RaiseAuthenticationFinished(this.userName);
}
}
}
}
}
}
}
}
}
else if (i == 4)
{
// Raise Started Data Transfer Event
this.RaiseStartedDataTransfer();
this.SendDataThroughSecureStream(message);
if (this.WaitForResponse(responses[i], ref responseText, false) == false)
{
this.errorMessage = "Did not get " + responses[i] + " reply from server for command " + commands[i] + ".\r\nServer said: " + responseText;
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
else
{
// Raise Ended Data Transfer Event
this.RaiseEndedDataTransfer();
}
}
else
{
this.SendDataThroughSecureStream(message);
if (this.WaitForResponse(responses[i], ref responseText, false) == false)
{
this.errorMessage = "Did not get " + responses[i] + " reply from server for command " + commands[i] + ".\r\nServer said: " + responseText;
this.tcp_Socket.Close();
throw new SmtpClientException(this.errorMessage);
}
if (i == 5)
{
if (tcp_Socket.Connected)
{
tcp_Socket.Close();
//Raise Disconnected Event
this.RaiseDisconnected(this.smtpServer);
}
}
}
}
}
}
if (tcp_Socket.Connected)
{
tcp_Socket.Close();
//Raise Disconnected Event
this.RaiseDisconnected(this.smtpServer);
}
return;
}
public void SendMail(string from, string recipient, string subject, string body)
{
this.mailMessage = new MailMessage(from, recipient, subject, body);
this.SendMail(this.mailMessage);
}
private void Send_Click(object sender, EventArgs e)
{
if (this.CheckInputValidation(SmtpServer.Text, SmtpPort.Text, UserName.Text, Password.Text, From.Text, To.Text, Cc.Text, Bcc.Text))
{
if (this.EmailValidation(this.From.Text))
{
bool isRecipient = false;
if (this.To.Text.Length > 0)
{
if (this.RecipientsEmailValidation(this.To.Text))
{
isRecipient = true;
}
else
{
MessageBox.Show(this, "Recipients' email address is not in the correct format, in \"To: \" field.", "Email Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
}
if (this.Cc.Text.Length > 0)
{
if (!(this.RecipientsEmailValidation(this.Cc.Text)))
{
MessageBox.Show(this, "Recipients' email address is not in the correct format, in \"Cc: \" field.", "Email Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
else
{
isRecipient = true;
}
}
if (this.Bcc.Text.Length > 0)
{
if (!(this.RecipientsEmailValidation(this.Bcc.Text)))
{
MessageBox.Show(this, "Recipients' email address is not in the correct format, in \"Bcc: \" field.", "Email Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
else
{
isRecipient = true;
}
}
if (Internet.IsConnectedToInternet())
{
if (isRecipient == true)
{
Rtf2Html rtf = new Rtf2Html();
string Html = rtf.ConvertRtfToHtml(this.MailMessage);
MailMessage mail_message = new MailMessage();
mail_message.From = this.From.Text;
mail_message.To = this.To.Text;
mail_message.CC = this.Cc.Text;
mail_message.BCC = this.Bcc.Text;
mail_message.Subject = this.Subject.Text;
mail_message.MailType = MailEncodingType.HTML;
mail_message.MailPriority = MailSendPriority.NORMAL;
mail_message.Message = Html;
mail_message.Attachments = this.attachments;
Thread thread = new Thread(new ParameterizedThreadStart(this.SendEmail));
thread.Start(mail_message);
}
else
{
return;
}
}
else
{
MessageBox.Show(this, "You must connect to the internet.", "Email Client", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
else
{
MessageBox.Show(this, "Sender email address is not in the correct format.", "Email Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}