Location: PHPKode > projects > cPassMan > cpassman/sources/class.smtp.php
<?php
////////////////////////////////////////////////////
// SMTP - PHP SMTP class
//
// Version 1.02
//
// Define an SMTP class that can be used to connect
// and communicate with any SMTP server. It implements
// all the SMTP functions defined in RFC821 except TURN.
//
// Author: Chris Ryan
//
// License: LGPL, see LICENSE
////////////////////////////////////////////////////

/**
 * SMTP is rfc 821 compliant and implements all the rfc 821 SMTP
 * commands except TURN which will always return a not implemented
 * error. SMTP also provides some utility methods for sending mail
 * to an SMTP server.
 * @package PHPMailer
 * @author Chris Ryan
 */
class SMTP
{
    /**
  SMTP server port
  @var int
     */
    var $SMTP_PORT = 25;
    
    /**
  SMTP reply line ending
  @var string
     */
    var $CRLF = "\r\n";
    
    /**
  Sets whether debugging is turned on
  @var bool
     */
    var $do_debug;       # the level of debug to perform

    /**#@+
 @access private
     */
    var $smtp_conn;      # the socket to the server
    var $error;          # error if any on the last call
    var $helo_rply;      # the reply the server sent to us for HELO
    /**#@-*/

    /**
 Initialize the class so that the data is in a known state.
 @access public
 @return void
     */
    function SMTP() {
        $this->smtp_conn = 0;
        $this->error = null;
        $this->helo_rply = null;

        $this->do_debug = 0;
    }

    /*************************************************************
                    CONNECTION FUNCTIONS                  *
     ***********************************************************/

    /**
 Connect to the server specified on the port specified.
 If the port is not specified use the default SMTP_PORT.
 If tval is specified then a connection will try and be
 established with the server for that number of seconds.
 If tval is not specified the default is 30 seconds to
 try on the connection.
     *
 SMTP CODE SUCCESS: 220
 SMTP CODE FAILURE: 421
 @access public
 @return bool
     */
    function Connect($host,$port=0,$tval=30) {
        # set the error val to null so there is no confusion
        $this->error = null;

        # make sure we are __not__ connected
        if($this->connected()) {
            # ok we are connected! what should we do?
            # for now we will just give an error saying we
            # are already connected
            $this->error =
                array("error" => "Already connected to a server");
            return false;
        }

        if(empty($port)) {
            $port = $this->SMTP_PORT;
        }

        #connect to the smtp server
        $this->smtp_conn = fsockopen($host,    # the host of the server
                                     $port,    # the port to use
                                     $errno,   # error number if any
                                     $errstr,  # error message if any
                                     $tval);   # give up after ? secs
        # verify we connected properly
        if(empty($this->smtp_conn)) {
            $this->error = array("error" => "Failed to connect to server",
                                 "errno" => $errno,
                                 "errstr" => $errstr);
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": $errstr ($errno)" . $this->CRLF;
            }
            return false;
        }

        # sometimes the SMTP server takes a little longer to respond
        # so we will give it a longer timeout for the first read
        // Windows still does not have support for this timeout function
        if(substr(PHP_OS, 0, 3) != "WIN")
           socket_set_timeout($this->smtp_conn, $tval, 0);

        # get any announcement stuff
        $announce = $this->get_lines();

        # set the timeout  of any socket functions at 1/10 of a second
        //if(function_exists("socket_set_timeout"))
        //   socket_set_timeout($this->smtp_conn, 0, 100000);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $announce;
        }

        return true;
    }

    /**
 Performs SMTP authentication.  Must be run after running the
 Hello() method.  Returns true if successfully authenticated.
 @access public
 @return bool
     */
    function Authenticate($username, $password) {
        // Start authentication
        fputs($this->smtp_conn,"AUTH LOGIN" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($code != 334) {
            $this->error =
                array("error" => "AUTH not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        // Send encoded username
        fputs($this->smtp_conn, base64_encode($username) . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($code != 334) {
            $this->error =
                array("error" => "Username not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        // Send encoded password
        fputs($this->smtp_conn, base64_encode($password) . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($code != 235) {
            $this->error =
                array("error" => "Password not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        return true;
    }

    /**
 Returns true if connected to a server otherwise false
 @access private
 @return bool
     */
    function Connected() {
        if(!empty($this->smtp_conn)) {
            $sock_status = socket_get_status($this->smtp_conn);
            if($sock_status["eof"]) {
                # hmm this is an odd situation... the socket is
                # valid but we aren't connected anymore
                if($this->do_debug >= 1) {
                    echo "SMTP -> NOTICE:" . $this->CRLF .
                         "EOF caught while checking if connected";
                }
                $this->Close();
                return false;
            }
            return true; # everything looks good
        }
        return false;
    }

    /**
 Closes the socket and cleans up the state of the class.
 It is not considered good to use this function without
 first trying to use QUIT.
 @access public
 @return void
     */
    function Close() {
        $this->error = null; # so there is no confusion
        $this->helo_rply = null;
        if(!empty($this->smtp_conn)) {
            # close the connection and cleanup
            fclose($this->smtp_conn);
            $this->smtp_conn = 0;
        }
    }


    /***************************************************************
                        SMTP COMMANDS                       *
     *************************************************************/

    /**
 Issues a data command and sends the msg_data to the server
 finializing the mail transaction. $msg_data is the message
 that is to be send with the headers. Each header needs to be
 on a single line followed by a <CRLF> with the message headers
 and the message body being seperated by and additional <CRLF>.
     *
 Implements rfc 821: DATA <CRLF>
     *
 SMTP CODE INTERMEDIATE: 354
     [data]
     <CRLF>.<CRLF>
     SMTP CODE SUCCESS: 250
     SMTP CODE FAILURE: 552,554,451,452
 SMTP CODE FAILURE: 451,554
 SMTP CODE ERROR  : 500,501,503,421
 @access public
 @return bool
     */
    function Data($msg_data) {
        $this->error = null; # so no confusion is caused

        if(!$this->connected()) {
            $this->error = array(
                    "error" => "Called Data() without being connected");
            return false;
        }

        fputs($this->smtp_conn,"DATA" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 354) {
            $this->error =
                array("error" => "DATA command not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        # the server is ready to accept data!
        # according to rfc 821 we should not send more than 1000
        # including the CRLF
        # characters on a single line so we will break the data up
        # into lines by \r and/or \n then if needed we will break
        # each of those into smaller lines to fit within the limit.
        # in addition we will be looking for lines that start with
        # a period '.' and append and additional period '.' to that
        # line. NOTE: this does not count towards are limit.

        # normalize the line breaks so we know the explode works
        $msg_data = str_replace("\r\n","\n",$msg_data);
        $msg_data = str_replace("\r","\n",$msg_data);
        $lines = explode("\n",$msg_data);

        # we need to find a good way to determine is headers are
        # in the msg_data or if it is a straight msg body
        # currently I'm assuming rfc 822 definitions of msg headers
        # and if the first field of the first line (':' sperated)
        # does not contain a space then it _should_ be a header
        # and we can process all lines before a blank "" line as
        # headers.
        $field = substr($lines[0],0,strpos($lines[0],":"));
        $in_headers = false;
        if(!empty($field) && !strstr($field," ")) {
            $in_headers = true;
        }

        $max_line_length = 998; # used below; set here for ease in change

        while(list(,$line) = @each($lines)) {
            $lines_out = null;
            if($line == "" && $in_headers) {
                $in_headers = false;
            }
            # ok we need to break this line up into several
            # smaller lines
            while(strlen($line) > $max_line_length) {
                $pos = strrpos(substr($line,0,$max_line_length)," ");

                # Patch to fix DOS attack
                if(!$pos) {
                    $pos = $max_line_length - 1;
                }

                $lines_out[] = substr($line,0,$pos);
                $line = substr($line,$pos + 1);
                # if we are processing headers we need to
                # add a LWSP-char to the front of the new line
                # rfc 822 on long msg headers
                if($in_headers) {
                    $line = "\t" . $line;
                }
            }
            $lines_out[] = $line;

            # now send the lines to the server
            while(list(,$line_out) = @each($lines_out)) {
                if(strlen($line_out) > 0)
                {
                    if(substr($line_out, 0, 1) == ".") {
                        $line_out = "." . $line_out;
                    }
                }
                fputs($this->smtp_conn,$line_out . $this->CRLF);
            }
        }

        # ok all the message data has been sent so lets get this
        # over with aleady
        fputs($this->smtp_conn, $this->CRLF . "." . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 250) {
            $this->error =
                array("error" => "DATA not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }
        return true;
    }

    /**
 Expand takes the name and asks the server to list all the
 people who are members of the _list_. Expand will return
 back and array of the result or false if an error occurs.
 Each value in the array returned has the format of:
     [ <full-name> <sp> ] <path>
 The definition of <path> is defined in rfc 821
     *
 Implements rfc 821: EXPN <SP> <string> <CRLF>
     *
 SMTP CODE SUCCESS: 250
 SMTP CODE FAILURE: 550
 SMTP CODE ERROR  : 500,501,502,504,421
 @access public
 @return string array
     */
    function Expand($name) {
        $this->error = null; # so no confusion is caused

        if(!$this->connected()) {
            $this->error = array(
                    "error" => "Called Expand() without being connected");
            return false;
        }

        fputs($this->smtp_conn,"EXPN " . $name . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 250) {
            $this->error =
                array("error" => "EXPN not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        # parse the reply and place in our array to return to user
        $entries = explode($this->CRLF,$rply);
        while(list(,$l) = @each($entries)) {
            $list[] = substr($l,4);
        }

        return $list;
    }

    /**
 Sends the HELO command to the smtp server.
 This makes sure that we and the server are in
 the same known state.
     *
 Implements from rfc 821: HELO <SP> <domain> <CRLF>
     *
 SMTP CODE SUCCESS: 250
 SMTP CODE ERROR  : 500, 501, 504, 421
 @access public
 @return bool
     */
    function Hello($host="") {
        $this->error = null; # so no confusion is caused

        if(!$this->connected()) {
            $this->error = array(
                    "error" => "Called Hello() without being connected");
            return false;
        }

        # if a hostname for the HELO wasn't specified determine
        # a suitable one to send
        if(empty($host)) {
            # we need to determine some sort of appopiate default
            # to send to the server
            $host = "localhost";
        }

        // Send extended hello first (RFC 2821)
        if(!$this->SendHello("EHLO", $host))
        {
            if(!$this->SendHello("HELO", $host))
                return false;
        }

        return true;
    }

    /**
 Sends a HELO/EHLO command.
 @access private
 @return bool
     */
    function SendHello($hello, $host) {
        fputs($this->smtp_conn, $hello . " " . $host . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER: " . $this->CRLF . $rply;
        }

        if($code != 250) {
            $this->error =
                array("error" => $hello . " not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        $this->helo_rply = $rply;
        
        return true;
    }

    /**
 Gets help information on the keyword specified. If the keyword
 is not specified then returns generic help, ussually contianing
 A list of keywords that help is available on. This function
 returns the results back to the user. It is up to the user to
 handle the returned data. If an error occurs then false is
 returned with $this->error set appropiately.
     *
 Implements rfc 821: HELP [ <SP> <string> ] <CRLF>
     *
 SMTP CODE SUCCESS: 211,214
 SMTP CODE ERROR  : 500,501,502,504,421
 @access public
 @return string
     */
    function Help($keyword="") {
        $this->error = null; # to avoid confusion

        if(!$this->connected()) {
            $this->error = array(
                    "error" => "Called Help() without being connected");
            return false;
        }

        $extra = "";
        if(!empty($keyword)) {
            $extra = " " . $keyword;
        }

        fputs($this->smtp_conn,"HELP" . $extra . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 211 && $code != 214) {
            $this->error =
                array("error" => "HELP not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        return $rply;
    }

    /**
 Starts a mail transaction from the email address specified in
 $from. Returns true if successful or false otherwise. If True
 the mail transaction is started and then one or more Recipient
 commands may be called followed by a Data command.
     *
 Implements rfc 821: MAIL <SP> FROM:<reverse-path> <CRLF>
     *
 SMTP CODE SUCCESS: 250
 SMTP CODE SUCCESS: 552,451,452
 SMTP CODE SUCCESS: 500,501,421
 @access public
 @return bool
     */
    function Mail($from) {
        $this->error = null; # so no confusion is caused

        if(!$this->connected()) {
            $this->error = array(
                    "error" => "Called Mail() without being connected");
            return false;
        }

        fputs($this->smtp_conn,"MAIL FROM:<" . $from . ">" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 250) {
            $this->error =
                array("error" => "MAIL not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }
        return true;
    }

    /**
 Sends the command NOOP to the SMTP server.
     *
 Implements from rfc 821: NOOP <CRLF>
     *
 SMTP CODE SUCCESS: 250
 SMTP CODE ERROR  : 500, 421
 @access public
 @return bool
     */
    function Noop() {
        $this->error = null; # so no confusion is caused

        if(!$this->connected()) {
            $this->error = array(
                    "error" => "Called Noop() without being connected");
            return false;
        }

        fputs($this->smtp_conn,"NOOP" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 250) {
            $this->error =
                array("error" => "NOOP not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }
        return true;
    }

    /**
 Sends the quit command to the server and then closes the socket
 if there is no error or the $close_on_error argument is true.
     *
 Implements from rfc 821: QUIT <CRLF>
     *
 SMTP CODE SUCCESS: 221
 SMTP CODE ERROR  : 500
 @access public
 @return bool
     */
    function Quit($close_on_error=true) {
        $this->error = null; # so there is no confusion

        if(!$this->connected()) {
            $this->error = array(
                    "error" => "Called Quit() without being connected");
            return false;
        }

        # send the quit command to the server
        fputs($this->smtp_conn,"quit" . $this->CRLF);

        # get any good-bye messages
        $byemsg = $this->get_lines();

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $byemsg;
        }

        $rval = true;
        $e = null;

        $code = substr($byemsg,0,3);
        if($code != 221) {
            # use e as a tmp var cause Close will overwrite $this->error
            $e = array("error" => "SMTP server rejected quit command",
                       "smtp_code" => $code,
                       "smtp_rply" => substr($byemsg,4));
            $rval = false;
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $e["error"] . ": " .
                         $byemsg . $this->CRLF;
            }
        }

        if(empty($e) || $close_on_error) {
            $this->Close();
        }

        return $rval;
    }

    /**
 Sends the command RCPT to the SMTP server with the TO: argument of $to.
 Returns true if the recipient was accepted false if it was rejected.
     *
 Implements from rfc 821: RCPT <SP> TO:<forward-path> <CRLF>
     *
 SMTP CODE SUCCESS: 250,251
 SMTP CODE FAILURE: 550,551,552,553,450,451,452
 SMTP CODE ERROR  : 500,501,503,421
 @access public
 @return bool
     */
    function Recipient($to) {
        $this->error = null; # so no confusion is caused

        if(!$this->connected()) {
            $this->error = array(
                    "error" => "Called Recipient() without being connected");
            return false;
        }

        fputs($this->smtp_conn,"RCPT TO:<" . $to . ">" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 250 && $code != 251) {
            $this->error =
                array("error" => "RCPT not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }
        return true;
    }

    /**
 Sends the RSET command to abort and transaction that is
 currently in progress. Returns true if successful false
 otherwise.
     *
 Implements rfc 821: RSET <CRLF>
     *
 SMTP CODE SUCCESS: 250
 SMTP CODE ERROR  : 500,501,504,421
 @access public
 @return bool
     */
    function Reset() {
        $this->error = null; # so no confusion is caused

        if(!$this->connected()) {
            $this->error = array(
                    "error" => "Called Reset() without being connected");
            return false;
        }

        fputs($this->smtp_conn,"RSET" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 250) {
            $this->error =
                array("error" => "RSET failed",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        return true;
    }

    /**
 Starts a mail transaction from the email address specified in
 $from. Returns true if successful or false otherwise. If True
 the mail transaction is started and then one or more Recipient
 commands may be called followed by a Data command. This command
 will send the message to the users terminal if they are logged
 in.
     *
 Implements rfc 821: SEND <SP> FROM:<reverse-path> <CRLF>
     *
 SMTP CODE SUCCESS: 250
 SMTP CODE SUCCESS: 552,451,452
 SMTP CODE SUCCESS: 500,501,502,421
 @access public
 @return bool
     */
    function Send($from) {
        $this->error = null; # so no confusion is caused

        if(!$this->connected()) {
            $this->error = array(
                    "error" => "Called Send() without being connected");
            return false;
        }

        fputs($this->smtp_conn,"SEND FROM:" . $from . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 250) {
            $this->error =
                array("error" => "SEND not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }
        return true;
    }

    /**
 Starts a mail transaction from the email address specified in
 $from. Returns true if successful or false otherwise. If True
 the mail transaction is started and then one or more Recipient
 commands may be called followed by a Data command. This command
 will send the message to the users terminal if they are logged
 in and send them an email.
     *
 Implements rfc 821: SAML <SP> FROM:<reverse-path> <CRLF>
     *
 SMTP CODE SUCCESS: 250
 SMTP CODE SUCCESS: 552,451,452
 SMTP CODE SUCCESS: 500,501,502,421
 @access public
 @return bool
     */
    function SendAndMail($from) {
        $this->error = null; # so no confusion is caused

        if(!$this->connected()) {
            $this->error = array(
                "error" => "Called SendAndMail() without being connected");
            return false;
        }

        fputs($this->smtp_conn,"SAML FROM:" . $from . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 250) {
            $this->error =
                array("error" => "SAML not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }
        return true;
    }

    /**
 Starts a mail transaction from the email address specified in
 $from. Returns true if successful or false otherwise. If True
 the mail transaction is started and then one or more Recipient
 commands may be called followed by a Data command. This command
 will send the message to the users terminal if they are logged
 in or mail it to them if they are not.
     *
 Implements rfc 821: SOML <SP> FROM:<reverse-path> <CRLF>
     *
 SMTP CODE SUCCESS: 250
 SMTP CODE SUCCESS: 552,451,452
 SMTP CODE SUCCESS: 500,501,502,421
 @access public
 @return bool
     */
    function SendOrMail($from) {
        $this->error = null; # so no confusion is caused

        if(!$this->connected()) {
            $this->error = array(
                "error" => "Called SendOrMail() without being connected");
            return false;
        }

        fputs($this->smtp_conn,"SOML FROM:" . $from . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 250) {
            $this->error =
                array("error" => "SOML not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }
        return true;
    }

    /**
 This is an optional command for SMTP that this class does not
 support. This method is here to make the RFC821 Definition
 complete for this class and __may__ be implimented in the future
     *
 Implements from rfc 821: TURN <CRLF>
     *
 SMTP CODE SUCCESS: 250
 SMTP CODE FAILURE: 502
 SMTP CODE ERROR  : 500, 503
 @access public
 @return bool
     */
    function Turn() {
        $this->error = array("error" => "This method, TURN, of the SMTP ".
                                        "is not implemented");
        if($this->do_debug >= 1) {
            echo "SMTP -> NOTICE: " . $this->error["error"] . $this->CRLF;
        }
        return false;
    }

    /**
 Verifies that the name is recognized by the server.
 Returns false if the name could not be verified otherwise
 the response from the server is returned.
     *
 Implements rfc 821: VRFY <SP> <string> <CRLF>
     *
 SMTP CODE SUCCESS: 250,251
 SMTP CODE FAILURE: 550,551,553
 SMTP CODE ERROR  : 500,501,502,421
 @access public
 @return int
     */
    function Verify($name) {
        $this->error = null; # so no confusion is caused

        if(!$this->connected()) {
            $this->error = array(
                    "error" => "Called Verify() without being connected");
            return false;
        }

        fputs($this->smtp_conn,"VRFY " . $name . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply,0,3);

        if($this->do_debug >= 2) {
            echo "SMTP -> FROM ".$pre."SERVER:" . $this->CRLF . $rply;
        }

        if($code != 250 && $code != 251) {
            $this->error =
                array("error" => "VRFY failed on name '$name'",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply,4));
            if($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }
        return $rply;
    }

    /*******************************************************************
                       INTERNAL FUNCTIONS                       *
     ******************************************************************/

    /**
 Read in as many lines as possible
 either before eof or socket timeout occurs on the operation.
 With SMTP we can tell if we have more lines to read if the
 4th character is '-' symbol. If it is a space then we don't
 need to read anything else.
 @access private
 @return string
     */
    function get_lines() {
        $data = "";
        while($str = fgets($this->smtp_conn,515)) {
            if($this->do_debug >= 4) {
                echo "SMTP -> get_lines(): \$data was \"$data\"" .
                         $this->CRLF;
                echo "SMTP -> get_lines(): \$str is \"$str\"" .
                         $this->CRLF;
            }
            $data .= $str;
            if($this->do_debug >= 4) {
                echo "SMTP -> get_lines(): \$data is \"$data\"" . $this->CRLF;
            }
            # if the 4th character is a space then we are done reading
            # so just break the loop
            if(substr($str,3,1) == " ") { break; }
        }
        return $data;
    }

}


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