SMTP.php
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SMTP.php
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	<?php
	/* vim: set expandtab softtabstop=4 tabstop=4 shiftwidth=4: */
	// +----------------------------------------------------------------------+
	// \| PHP Version 4 \|
	// +----------------------------------------------------------------------+
	// \| Copyright (c) 1997-2003 The PHP Group \|
	// +----------------------------------------------------------------------+
	// \| This source file is subject to version 2.02 of the PHP license, \|
	// \| that is bundled with this package in the file LICENSE, and is \|
	// \| available at through the world-wide-web at \|
	// \| http://www.php.net/license/2_02.txt. \|
	// \| If you did not receive a copy of the PHP license and are unable to \|
	// \| obtain it through the world-wide-web, please send a note to \|
	// \| license@php.net so we can mail you a copy immediately. \|
	// +----------------------------------------------------------------------+
	// \| Authors: Chuck Hagenbuch <chuck@horde.org> \|
	// \| Jon Parise <jon@php.net> \|
	// \| Damian Alejandro Fernandez Sosa <damlists@cnba.uba.ar> \|
	// +----------------------------------------------------------------------+
	//
	// $Id$

	require_once 'PEAR.php';
	require_once 'Net/Socket.php';

	/**
	* Provides an implementation of the SMTP protocol using PEAR's
	* Net_Socket:: class.
	*
	* @package Net_SMTP
	* @author Chuck Hagenbuch <chuck@horde.org>
	* @author Jon Parise <jon@php.net>
	* @author Damian Alejandro Fernandez Sosa <damlists@cnba.uba.ar>
	*
	* @example basic.php A basic implementation of the Net_SMTP package.
	*/
	class Net_SMTP
	{
	/**
	* The server to connect to.
	* @var string
	* @access public
	*/
	var $host = 'localhost';

	/**
	* The port to connect to.
	* @var int
	* @access public
	*/
	var $port = 25;

	/**
	* The value to give when sending EHLO or HELO.
	* @var string
	* @access public
	*/
	var $localhost = 'localhost';

	/**
	* List of supported authentication methods, in preferential order.
	* @var array
	* @access public
	*/
	var $auth_methods = array('DIGEST-MD5', 'CRAM-MD5', 'LOGIN', 'PLAIN');

	/**
	* Use SMTP command pipelining (specified in RFC 2920) if the SMTP
	* server supports it.
	*
	* When pipeling is enabled, rcptTo(), mailFrom(), sendFrom(),
	* somlFrom() and samlFrom() do not wait for a response from the
	* SMTP server but return immediately.
	*
	* @var bool
	* @access public
	*/
	var $pipelining = false;

	/**
	* Number of pipelined commands.
	* @var int
	* @access private
	*/
	var $_pipelined_commands = 0;

	/**
	* Should debugging output be enabled?
	* @var boolean
	* @access private
	*/
	var $_debug = false;

	/**
	* Debug output handler.
	* @var callback
	* @access private
	*/
	var $_debug_handler = null;

	/**
	* The socket resource being used to connect to the SMTP server.
	* @var resource
	* @access private
	*/
	var $_socket = null;

	/**
	* The most recent server response code.
	* @var int
	* @access private
	*/
	var $_code = -1;

	/**
	* The most recent server response arguments.
	* @var array
	* @access private
	*/
	var $_arguments = array();

	/**
	* Stores the SMTP server's greeting string.
	* @var string
	* @access private
	*/
	var $_greeting = null;

	/**
	* Stores detected features of the SMTP server.
	* @var array
	* @access private
	*/
	var $_esmtp = array();

	/**
	* Instantiates a new Net_SMTP object, overriding any defaults
	* with parameters that are passed in.
	*
	* If you have SSL support in PHP, you can connect to a server
	* over SSL using an 'ssl://' prefix:
	*
	* // 465 is a common smtps port.
	* $smtp = new Net_SMTP('ssl://mail.host.com', 465);
	* $smtp->connect();
	*
	* @param string $host The server to connect to.
	* @param integer $port The port to connect to.
	* @param string $localhost The value to give when sending EHLO or HELO.
	* @param boolean $pipeling Use SMTP command pipelining
	*
	* @access public
	* @since 1.0
	*/
	function Net_SMTP($host = null, $port = null, $localhost = null, $pipelining = false)
	{
	if (isset($host)) {
	$this->host = $host;
	}
	if (isset($port)) {
	$this->port = $port;
	}
	if (isset($localhost)) {
	$this->localhost = $localhost;
	}
	$this->pipelining = $pipelining;

	$this->_socket = new Net_Socket();

	/* Include the Auth_SASL package. If the package is not
	* available, we disable the authentication methods that
	* depend upon it. */
	if ((@include_once 'Auth/SASL.php') === false) {
	$pos = array_search('DIGEST-MD5', $this->auth_methods);
	unset($this->auth_methods[$pos]);
	$pos = array_search('CRAM-MD5', $this->auth_methods);
	unset($this->auth_methods[$pos]);
	}
	}

	/**
	* Set the value of the debugging flag.
	*
	* @param boolean $debug New value for the debugging flag.
	*
	* @access public
	* @since 1.1.0
	*/
	function setDebug($debug, $handler = null)
	{
	$this->_debug = $debug;
	$this->_debug_handler = $handler;
	}

	/**
	* Write the given debug text to the current debug output handler.
	*
	* @param string $message Debug mesage text.
	*
	* @access private
	* @since 1.3.3
	*/
	function _debug($message)
	{
	if ($this->_debug) {
	if ($this->_debug_handler) {
	call_user_func_array($this->_debug_handler,
	array(&$this, $message));
	} else {
	echo "DEBUG: $message\n";
	}
	}
	}

	/**
	* Send the given string of data to the server.
	*
	* @param string $data The string of data to send.
	*
	* @return mixed True on success or a PEAR_Error object on failure.
	*
	* @access private
	* @since 1.1.0
	*/
	function _send($data)
	{
	$this->_debug("Send: $data");

	$error = $this->_socket->write($data);
	if ($error === false \|\| PEAR::isError($error)) {
	$msg = ($error) ? $error->getMessage() : "unknown error";
	return PEAR::raiseError("Failed to write to socket: $msg");
	}

	return true;
	}

	/**
	* Send a command to the server with an optional string of
	* arguments. A carriage return / linefeed (CRLF) sequence will
	* be appended to each command string before it is sent to the
	* SMTP server - an error will be thrown if the command string
	* already contains any newline characters. Use _send() for
	* commands that must contain newlines.
	*
	* @param string $command The SMTP command to send to the server.
	* @param string $args A string of optional arguments to append
	* to the command.
	*
	* @return mixed The result of the _send() call.
	*
	* @access private
	* @since 1.1.0
	*/
	function _put($command, $args = '')
	{
	if (!empty($args)) {
	$command .= ' ' . $args;
	}

	if (strcspn($command, "\r\n") !== strlen($command)) {
	return PEAR::raiseError('Commands cannot contain newlines');
	}

	return $this->_send($command . "\r\n");
	}

	/**
	* Read a reply from the SMTP server. The reply consists of a response
	* code and a response message.
	*
	* @param mixed $valid The set of valid response codes. These
	* may be specified as an array of integer
	* values or as a single integer value.
	* @param bool $later Do not parse the response now, but wait
	* until the last command in the pipelined
	* command group
	*
	* @return mixed True if the server returned a valid response code or
	* a PEAR_Error object is an error condition is reached.
	*
	* @access private
	* @since 1.1.0
	*
	* @see getResponse
	*/
	function _parseResponse($valid, $later = false)
	{
	$this->_code = -1;
	$this->_arguments = array();

	if ($later) {
	$this->_pipelined_commands++;
	return true;
	}

	for ($i = 0; $i <= $this->_pipelined_commands; $i++) {
	while ($line = $this->_socket->readLine()) {
	$this->_debug("Recv: $line");

	/* If we receive an empty line, the connection has been closed. */
	if (empty($line)) {
	$this->disconnect();
	return PEAR::raiseError('Connection was unexpectedly closed');
	}

	/* Read the code and store the rest in the arguments array. */
	$code = substr($line, 0, 3);
	$this->_arguments[] = trim(substr($line, 4));

	/* Check the syntax of the response code. */
	if (is_numeric($code)) {
	$this->_code = (int)$code;
	} else {
	$this->_code = -1;
	break;
	}

	/* If this is not a multiline response, we're done. */
	if (substr($line, 3, 1) != '-') {
	break;
	}
	}
	}

	$this->_pipelined_commands = 0;

	/* Compare the server's response code with the valid code/codes. */
	if (is_int($valid) && ($this->_code === $valid)) {
	return true;
	} elseif (is_array($valid) && in_array($this->_code, $valid, true)) {
	return true;
	}

	return PEAR::raiseError('Invalid response code received from server',
	$this->_code);
	}

	/**
	* Return a 2-tuple containing the last response from the SMTP server.
	*
	* @return array A two-element array: the first element contains the
	* response code as an integer and the second element
	* contains the response's arguments as a string.
	*
	* @access public
	* @since 1.1.0
	*/
	function getResponse()
	{
	return array($this->_code, join("\n", $this->_arguments));
	}

	/**
	* Return the SMTP server's greeting string.
	*
	* @return string A string containing the greeting string, or null if a
	* greeting has not been received.
	*
	* @access public
	* @since 1.3.3
	*/
	function getGreeting()
	{
	return $this->_greeting;
	}

	/**
	* Attempt to connect to the SMTP server.
	*
	* @param int $timeout The timeout value (in seconds) for the
	* socket connection.
	* @param bool $persistent Should a persistent socket connection
	* be used?
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.0
	*/
	function connect($timeout = null, $persistent = false)
	{
	$this->_greeting = null;
	$result = $this->_socket->connect($this->host, $this->port,
	$persistent, $timeout);
	if (PEAR::isError($result)) {
	return PEAR::raiseError('Failed to connect socket: ' .
	$result->getMessage());
	}

	if (PEAR::isError($error = $this->_parseResponse(220))) {
	return $error;
	}

	/* Extract and store a copy of the server's greeting string. */
	list(, $this->_greeting) = $this->getResponse();

	if (PEAR::isError($error = $this->_negotiate())) {
	return $error;
	}

	return true;
	}

	/**
	* Attempt to disconnect from the SMTP server.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.0
	*/
	function disconnect()
	{
	if (PEAR::isError($error = $this->_put('QUIT'))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_parseResponse(221))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_socket->disconnect())) {
	return PEAR::raiseError('Failed to disconnect socket: ' .
	$error->getMessage());
	}

	return true;
	}

	/**
	* Attempt to send the EHLO command and obtain a list of ESMTP
	* extensions available, and failing that just send HELO.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	*
	* @access private
	* @since 1.1.0
	*/
	function _negotiate()
	{
	if (PEAR::isError($error = $this->_put('EHLO', $this->localhost))) {
	return $error;
	}

	if (PEAR::isError($this->_parseResponse(250))) {
	/* If we receive a 503 response, we're already authenticated. */
	if ($this->_code === 503) {
	return true;
	}

	/* If the EHLO failed, try the simpler HELO command. */
	if (PEAR::isError($error = $this->_put('HELO', $this->localhost))) {
	return $error;
	}
	if (PEAR::isError($this->_parseResponse(250))) {
	return PEAR::raiseError('HELO was not accepted: ', $this->_code);
	}

	return true;
	}

	foreach ($this->_arguments as $argument) {
	$verb = strtok($argument, ' ');
	$arguments = substr($argument, strlen($verb) + 1,
	strlen($argument) - strlen($verb) - 1);
	$this->_esmtp[$verb] = $arguments;
	}

	if (!isset($this->_esmtp['PIPELINING'])) {
	$this->pipelining = false;
	}

	return true;
	}

	/**
	* Returns the name of the best authentication method that the server
	* has advertised.
	*
	* @return mixed Returns a string containing the name of the best
	* supported authentication method or a PEAR_Error object
	* if a failure condition is encountered.
	* @access private
	* @since 1.1.0
	*/
	function _getBestAuthMethod()
	{
	$available_methods = explode(' ', $this->_esmtp['AUTH']);

	foreach ($this->auth_methods as $method) {
	if (in_array($method, $available_methods)) {
	return $method;
	}
	}

	return PEAR::raiseError('No supported authentication methods');
	}

	/**
	* Attempt to do SMTP authentication.
	*
	* @param string The userid to authenticate as.
	* @param string The password to authenticate with.
	* @param string The requested authentication method. If none is
	* specified, the best supported method will be used.
	* @param bool Flag indicating whether or not TLS should be attempted.
	* @param string An optional authorization identifier. If specified, this
	* identifier will be used as the authorization proxy.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.0
	*/
	function auth($uid, $pwd , $method = '', $tls = true, $authz = '')
	{
	/* We can only attempt a TLS connection if one has been requested,
	* we're running PHP 5.1.0 or later, have access to the OpenSSL
	* extension, are connected to an SMTP server which supports the
	* STARTTLS extension, and aren't already connected over a secure
	* (SSL) socket connection. */
	if ($tls && version_compare(PHP_VERSION, '5.1.0', '>=') &&
	extension_loaded('openssl') && isset($this->_esmtp['STARTTLS']) &&
	strncasecmp($this->host, 'ssl://', 6) !== 0) {
	/* Start the TLS connection attempt. */
	if (PEAR::isError($result = $this->_put('STARTTLS'))) {
	return $result;
	}
	if (PEAR::isError($result = $this->_parseResponse(220))) {
	return $result;
	}
	if (PEAR::isError($result = $this->_socket->enableCrypto(true, STREAM_CRYPTO_METHOD_TLS_CLIENT))) {
	return $result;
	} elseif ($result !== true) {
	return PEAR::raiseError('STARTTLS failed');
	}

	/* Send EHLO again to recieve the AUTH string from the
	* SMTP server. */
	$this->_negotiate();
	}

	if (empty($this->_esmtp['AUTH'])) {
	return PEAR::raiseError('SMTP server does not support authentication');
	}

	/* If no method has been specified, get the name of the best
	* supported method advertised by the SMTP server. */
	if (empty($method)) {
	if (PEAR::isError($method = $this->_getBestAuthMethod())) {
	/* Return the PEAR_Error object from _getBestAuthMethod(). */
	return $method;
	}
	} else {
	$method = strtoupper($method);
	if (!in_array($method, $this->auth_methods)) {
	return PEAR::raiseError("$method is not a supported authentication method");
	}
	}

	switch ($method) {
	case 'DIGEST-MD5':
	$result = $this->_authDigest_MD5($uid, $pwd, $authz);
	break;

	case 'CRAM-MD5':
	$result = $this->_authCRAM_MD5($uid, $pwd);
	break;

	case 'LOGIN':
	$result = $this->_authLogin($uid, $pwd);
	break;

	case 'PLAIN':
	$result = $this->_authPlain($uid, $pwd, $authz);
	break;

	default:
	$result = PEAR::raiseError("$method is not a supported authentication method");
	break;
	}

	/* If an error was encountered, return the PEAR_Error object. */
	if (PEAR::isError($result)) {
	return $result;
	}

	return true;
	}

	/**
	* Authenticates the user using the DIGEST-MD5 method.
	*
	* @param string The userid to authenticate as.
	* @param string The password to authenticate with.
	* @param string The optional authorization proxy identifier.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access private
	* @since 1.1.0
	*/
	function _authDigest_MD5($uid, $pwd, $authz = '')
	{
	if (PEAR::isError($error = $this->_put('AUTH', 'DIGEST-MD5'))) {
	return $error;
	}
	/* 334: Continue authentication request */
	if (PEAR::isError($error = $this->_parseResponse(334))) {
	/* 503: Error: already authenticated */
	if ($this->_code === 503) {
	return true;
	}
	return $error;
	}

	$challenge = base64_decode($this->_arguments[0]);
	$digest = &Auth_SASL::factory('digestmd5');
	$auth_str = base64_encode($digest->getResponse($uid, $pwd, $challenge,
	$this->host, "smtp", $authz));

	if (PEAR::isError($error = $this->_put($auth_str))) {
	return $error;
	}
	/* 334: Continue authentication request */
	if (PEAR::isError($error = $this->_parseResponse(334))) {
	return $error;
	}

	/* We don't use the protocol's third step because SMTP doesn't
	* allow subsequent authentication, so we just silently ignore
	* it. */
	if (PEAR::isError($error = $this->_put(''))) {
	return $error;
	}
	/* 235: Authentication successful */
	if (PEAR::isError($error = $this->_parseResponse(235))) {
	return $error;
	}
	}

	/**
	* Authenticates the user using the CRAM-MD5 method.
	*
	* @param string The userid to authenticate as.
	* @param string The password to authenticate with.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access private
	* @since 1.1.0
	*/
	function _authCRAM_MD5($uid, $pwd)
	{
	if (PEAR::isError($error = $this->_put('AUTH', 'CRAM-MD5'))) {
	return $error;
	}
	/* 334: Continue authentication request */
	if (PEAR::isError($error = $this->_parseResponse(334))) {
	/* 503: Error: already authenticated */
	if ($this->_code === 503) {
	return true;
	}
	return $error;
	}

	$challenge = base64_decode($this->_arguments[0]);
	$cram = &Auth_SASL::factory('crammd5');
	$auth_str = base64_encode($cram->getResponse($uid, $pwd, $challenge));

	if (PEAR::isError($error = $this->_put($auth_str))) {
	return $error;
	}

	/* 235: Authentication successful */
	if (PEAR::isError($error = $this->_parseResponse(235))) {
	return $error;
	}
	}

	/**
	* Authenticates the user using the LOGIN method.
	*
	* @param string The userid to authenticate as.
	* @param string The password to authenticate with.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access private
	* @since 1.1.0
	*/
	function _authLogin($uid, $pwd)
	{
	if (PEAR::isError($error = $this->_put('AUTH', 'LOGIN'))) {
	return $error;
	}
	/* 334: Continue authentication request */
	if (PEAR::isError($error = $this->_parseResponse(334))) {
	/* 503: Error: already authenticated */
	if ($this->_code === 503) {
	return true;
	}
	return $error;
	}

	if (PEAR::isError($error = $this->_put(base64_encode($uid)))) {
	return $error;
	}
	/* 334: Continue authentication request */
	if (PEAR::isError($error = $this->_parseResponse(334))) {
	return $error;
	}

	if (PEAR::isError($error = $this->_put(base64_encode($pwd)))) {
	return $error;
	}

	/* 235: Authentication successful */
	if (PEAR::isError($error = $this->_parseResponse(235))) {
	return $error;
	}

	return true;
	}

	/**
	* Authenticates the user using the PLAIN method.
	*
	* @param string The userid to authenticate as.
	* @param string The password to authenticate with.
	* @param string The optional authorization proxy identifier.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access private
	* @since 1.1.0
	*/
	function _authPlain($uid, $pwd, $authz = '')
	{
	if (PEAR::isError($error = $this->_put('AUTH', 'PLAIN'))) {
	return $error;
	}
	/* 334: Continue authentication request */
	if (PEAR::isError($error = $this->_parseResponse(334))) {
	/* 503: Error: already authenticated */
	if ($this->_code === 503) {
	return true;
	}
	return $error;
	}

	$auth_str = base64_encode($authz . chr(0) . $uid . chr(0) . $pwd);

	if (PEAR::isError($error = $this->_put($auth_str))) {
	return $error;
	}

	/* 235: Authentication successful */
	if (PEAR::isError($error = $this->_parseResponse(235))) {
	return $error;
	}

	return true;
	}

	/**
	* Send the HELO command.
	*
	* @param string The domain name to say we are.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.0
	*/
	function helo($domain)
	{
	if (PEAR::isError($error = $this->_put('HELO', $domain))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_parseResponse(250))) {
	return $error;
	}

	return true;
	}

	/**
	* Return the list of SMTP service extensions advertised by the server.
	*
	* @return array The list of SMTP service extensions.
	* @access public
	* @since 1.3
	*/
	function getServiceExtensions()
	{
	return $this->_esmtp;
	}

	/**
	* Send the MAIL FROM: command.
	*
	* @param string $sender The sender (reverse path) to set.
	* @param string $params String containing additional MAIL parameters,
	* such as the NOTIFY flags defined by RFC 1891
	* or the VERP protocol.
	*
	* If $params is an array, only the 'verp' option
	* is supported. If 'verp' is true, the XVERP
	* parameter is appended to the MAIL command. If
	* the 'verp' value is a string, the full
	* XVERP=value parameter is appended.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.0
	*/
	function mailFrom($sender, $params = null)
	{
	$args = "FROM:<$sender>";

	/* Support the deprecated array form of $params. */
	if (is_array($params) && isset($params['verp'])) {
	/* XVERP */
	if ($params['verp'] === true) {
	$args .= ' XVERP';

	/* XVERP=something */
	} elseif (trim($params['verp'])) {
	$args .= ' XVERP=' . $params['verp'];
	}
	} elseif (is_string($params)) {
	$args .= ' ' . $params;
	}

	if (PEAR::isError($error = $this->_put('MAIL', $args))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_parseResponse(250, $this->pipelining))) {
	return $error;
	}

	return true;
	}

	/**
	* Send the RCPT TO: command.
	*
	* @param string $recipient The recipient (forward path) to add.
	* @param string $params String containing additional RCPT parameters,
	* such as the NOTIFY flags defined by RFC 1891.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	*
	* @access public
	* @since 1.0
	*/
	function rcptTo($recipient, $params = null)
	{
	$args = "TO:<$recipient>";
	if (is_string($params)) {
	$args .= ' ' . $params;
	}

	if (PEAR::isError($error = $this->_put('RCPT', $args))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_parseResponse(array(250, 251), $this->pipelining))) {
	return $error;
	}

	return true;
	}

	/**
	* Quote the data so that it meets SMTP standards.
	*
	* This is provided as a separate public function to facilitate
	* easier overloading for the cases where it is desirable to
	* customize the quoting behavior.
	*
	* @param string $data The message text to quote. The string must be passed
	* by reference, and the text will be modified in place.
	*
	* @access public
	* @since 1.2
	*/
	function quotedata(&$data)
	{
	/* Change Unix (\n) and Mac (\r) linefeeds into
	* Internet-standard CRLF (\r\n) linefeeds. */
	$data = preg_replace(array('/(?<!\r)\n/','/\r(?!\n)/'), "\r\n", $data);

	/* Because a single leading period (.) signifies an end to the
	* data, legitimate leading periods need to be "doubled"
	* (e.g. '..'). */
	$data = str_replace("\n.", "\n..", $data);
	}

	/**
	* Send the DATA command.
	*
	* @param mixed $data The message data, either as a string or an open
	* file resource.
	* @param string $headers The message headers. If $headers is provided,
	* $data is assumed to contain only body data.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.0
	*/
	function data($data, $headers = null)
	{
	/* Verify that $data is a supported type. */
	if (!is_string($data) && !is_resource($data)) {
	return PEAR::raiseError('Expected a string or file resource');
	}

	/* RFC 1870, section 3, subsection 3 states "a value of zero
	* indicates that no fixed maximum message size is in force".
	* Furthermore, it says that if "the parameter is omitted no
	* information is conveyed about the server's fixed maximum
	* message size". */
	if (isset($this->_esmtp['SIZE']) && ($this->_esmtp['SIZE'] > 0)) {
	/* Start by considering the size of the optional headers string.
	* We also account for the addition 4 character "\r\n\r\n"
	* separator sequence. */
	$size = (is_null($headers)) ? 0 : strlen($headers) + 4;

	if (is_resource($data)) {
	$stat = fstat($data);
	if ($stat === false) {
	return PEAR::raiseError('Failed to get file size');
	}
	$size += $stat['size'];
	} else {
	$size += strlen($data);
	}

	if ($size >= $this->_esmtp['SIZE']) {
	$this->disconnect();
	return PEAR::raiseError('Message size exceeds server limit');
	}
	}

	/* Initiate the DATA command. */
	if (PEAR::isError($error = $this->_put('DATA'))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_parseResponse(354))) {
	return $error;
	}

	/* If we have a separate headers string, send it first. */
	if (!is_null($headers)) {
	$this->quotedata($headers);
	if (PEAR::isError($result = $this->_send($headers . "\r\n\r\n"))) {
	return $result;
	}
	}

	/* Now we can send the message body data. */
	if (is_resource($data)) {
	/* Stream the contents of the file resource out over our socket
	* connection, line by line. Each line must be run through the
	* quoting routine. */
	while ($line = fgets($data, 1024)) {
	$this->quotedata($line);
	if (PEAR::isError($result = $this->_send($line))) {
	return $result;
	}
	}
	} else {
	if (!isset($size))
	$size = strlen($data);
	/*
	* Break up the data by sending one chunk (up to 512k) at a time.
	* This approach reduces our peak memory usage.
	*/
	for ($offset = 0; $offset < $size;) {
	$end = $offset + 512000;

	/*
	* Ensure we don't read beyond our data size or span multiple
	* lines. quotedata() can't properly handle character data
	* that's split across two line break boundaries.
	*/
	if ($end >= $size) {
	$end = $size;
	} else {
	for (; $end < $size; $end++) {
	if ($data[$end] != "\n") {
	break;
	}
	}
	}

	/* Extract our chunk and run it through the quoting routine. */
	$chunk = substr($data, $offset, $end - $offset);
	$this->quotedata($chunk);

	/* If we run into a problem along the way, abort. */
	if (PEAR::isError($result = $this->_send($chunk))) {
	return $result;
	}

	/* Advance the offset to the end of this chunk. */
	$offset = $end;
	}
	}

	/* Finally, send the DATA terminator sequence. */
	if (PEAR::isError($result = $this->_send("\r\n.\r\n"))) {
	return $result;
	}

	/* Verify that the data was successfully received by the server. */
	if (PEAR::isError($error = $this->_parseResponse(250, $this->pipelining))) {
	return $error;
	}

	return true;
	}

	/**
	* Send the SEND FROM: command.
	*
	* @param string The reverse path to send.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.2.6
	*/
	function sendFrom($path)
	{
	if (PEAR::isError($error = $this->_put('SEND', "FROM:<$path>"))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_parseResponse(250, $this->pipelining))) {
	return $error;
	}

	return true;
	}

	/**
	* Backwards-compatibility wrapper for sendFrom().
	*
	* @param string The reverse path to send.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	*
	* @access public
	* @since 1.0
	* @deprecated 1.2.6
	*/
	function send_from($path)
	{
	return sendFrom($path);
	}

	/**
	* Send the SOML FROM: command.
	*
	* @param string The reverse path to send.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.2.6
	*/
	function somlFrom($path)
	{
	if (PEAR::isError($error = $this->_put('SOML', "FROM:<$path>"))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_parseResponse(250, $this->pipelining))) {
	return $error;
	}

	return true;
	}

	/**
	* Backwards-compatibility wrapper for somlFrom().
	*
	* @param string The reverse path to send.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	*
	* @access public
	* @since 1.0
	* @deprecated 1.2.6
	*/
	function soml_from($path)
	{
	return somlFrom($path);
	}

	/**
	* Send the SAML FROM: command.
	*
	* @param string The reverse path to send.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.2.6
	*/
	function samlFrom($path)
	{
	if (PEAR::isError($error = $this->_put('SAML', "FROM:<$path>"))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_parseResponse(250, $this->pipelining))) {
	return $error;
	}

	return true;
	}

	/**
	* Backwards-compatibility wrapper for samlFrom().
	*
	* @param string The reverse path to send.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	*
	* @access public
	* @since 1.0
	* @deprecated 1.2.6
	*/
	function saml_from($path)
	{
	return samlFrom($path);
	}

	/**
	* Send the RSET command.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.0
	*/
	function rset()
	{
	if (PEAR::isError($error = $this->_put('RSET'))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_parseResponse(250, $this->pipelining))) {
	return $error;
	}

	return true;
	}

	/**
	* Send the VRFY command.
	*
	* @param string The string to verify
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.0
	*/
	function vrfy($string)
	{
	/* Note: 251 is also a valid response code */
	if (PEAR::isError($error = $this->_put('VRFY', $string))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_parseResponse(array(250, 252)))) {
	return $error;
	}

	return true;
	}

	/**
	* Send the NOOP command.
	*
	* @return mixed Returns a PEAR_Error with an error message on any
	* kind of failure, or true on success.
	* @access public
	* @since 1.0
	*/
	function noop()
	{
	if (PEAR::isError($error = $this->_put('NOOP'))) {
	return $error;
	}
	if (PEAR::isError($error = $this->_parseResponse(250))) {
	return $error;
	}

	return true;
	}

	/**
	* Backwards-compatibility method. identifySender()'s functionality is
	* now handled internally.
	*
	* @return boolean This method always return true.
	*
	* @access public
	* @since 1.0
	*/
	function identifySender()
	{
	return true;
	}

	}

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