C#

MailMessage msg = new MailMessage();
msg.From = "crawler@deepak.portland.co.uk";
msg.To = "crawler@deepak.portland.co.uk";
msg.Subject = "Test";
msg.Body = "Hi! Hello" +"\nSent Via MailMessage and SmtpMail Class";
SmtpMail.SmtpServer = "smtp.yourmailserver.yourisp.com";
SmtpMail.Send(msg);
SmtpMail.Send("crawler@deepak.portland.co.uk","crawler@deepak.portland.co.uk","Test","Hi! Hello\nSent Via SmtpMail class");

<br />
				//introduce ourselves<br />
				buf.Append("HELO ");<br />
				buf.Append(host);<br />
				con.SendCommand(buf.ToString());<br />
				con.GetReply(out response, out code);<br />
				buf.Length = 0;<br />
<br />
if(!AuthLoginPlain(con, user, password)) {<br />
// Failed<br />
con.Close();<br />
throw .... // throw an error<br />
}<br />
<br />
...<br />
<br />
<br />
		private bool AuthLoginPlain(SmtpConnection con, string user, string pass)<br />
		{<br />
			//Envia o comand AUTH LOGIN<br />
			StringBuilder buf = new StringBuilder();<br />
			byte [] b_user = System.Text.Encoding.ASCII.GetBytes(user);<br />
			byte [] b_pass = System.Text.Encoding.ASCII.GetBytes(pass);<br />
			string response;<br />
			string res;<br />
			string data;<br />
			int code;<br />
			buf.Append("AUTH LOGIN");<br />
			con.SendCommand(buf.ToString());<br />
			con.GetReply(out response, out code);<br />
			buf.Length = 0;<br />
			if(code == 334) <br />
			{<br />
				//pega ultima resposta menos o codigo de resposta<br />
				response = response.Substring(4);<br />
				res = System.Text.Encoding.ASCII.GetString(Convert.FromBase64String(response));<br />
				if(res == "Username:") <br />
				{<br />
					//envia o nome de <br />
					data = Convert.ToBase64String(b_user);<br />
					buf.Append(data);<br />
					con.SendCommand(buf.ToString());<br />
					con.GetReply(out response, out code);<br />
					buf.Length = 0;<br />
				}<br />
				if(code != 334) <br />
				{<br />
					return false;<br />
				}<br />
				response = response.Substring(4);<br />
				res = System.Text.Encoding.ASCII.GetString(Convert.FromBase64String(response));<br />
				if(res == "Password:") <br />
				{<br />
					// manda senha em plain<br />
					data = Convert.ToBase64String(b_pass);<br />
					buf.Append(data);<br />
					con.SendCommand(buf.ToString());<br />
					con.GetReply(out response, out code);<br />
					if(code != 235) <br />
					{<br />
						// falhou!<br />
						return false;<br />
					}<br />
					// se chegou até aqui, ok!<br />
					return true;<br />
				}<br />
			}<br />
			return false;<br />
		}<br />