Sending Mail in C#

[Sassan Komeili Zadeh]

Dear Sirs, Please guide me how I can send Mails in .NET via an SMTP Server which requires SMTP Authentication. Regards, Sassan Komeili Zadeh

[Vasudevan Deepak Kumar]

Hmm... There have been umpteen articles on this topic in 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");

Include System.Web.Mail namespace for the above methods to be visible to the compiler. Deepak Kumar Vasudevan http://deepak.portland.co.uk/

[leppie]

Deepak Kumar Vasudevan wrote: There have been umpteen articles on this topic in C#. But he was asking about SMTP with authentication....;P MyDUMeter: a .NET DUMeter clone

[leppie]

Try adding the username and password to the front of the URl of the SMTP server. eg user:pass@smtp.isp.net Not sure if it will work though. MyDUMeter: a .NET DUMeter clone

[Sassan Komeili Zadeh]

Thanks. My Mail Server POP3 account username is: info@xyz.com and when I try what you suggested, I get no answer. Would you suggest another solution? Regards, Sassan

[John Mautari]

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