ESMTP 메일 전송(소켓 메일) ----------------------- HELO 127.0.0.1 TLS ( STARTTLS HELO 127.0.0.1 ) AUTH ( AUTH LOGIN base64_encode(username) base64_encode(password) ) MAIL FROM: <from@foobar.com> RCPT TO: <to@foobar.com> DATA To: <to@foobar.com> From: <from@foobar.com> Subject: title .... Content-type: text/html; charset=euc-kr <ENTER> body ................. <ENTER> . QUIT --------------------