Sendmail.php

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<?php
#require_once 'Zend/Mail/Transport/Abstract.php';


class Zend_Mail_Transport_Sendmail extends Zend_Mail_Transport_Abstract
{
    public $subject = null;

    public $parameters;

    public $EOL = PHP_EOL;

    protected $_errstr;

    public function __construct($parameters = null)
    {
        if ($parameters instanceof Zend_Config) {
            $parameters = $parameters->toArray();
        }

        if (is_array($parameters)) {
            $parameters = implode(' ', $parameters);
        }

        $this->parameters = $parameters;
    }

    public function _sendMail()
    {
        set_error_handler(array($this, '_handleMailErrors'));
        $result = mail(
            $this->recipients,
            $this->_mail->getSubject(),
            $this->body,
            $this->header);
        restore_error_handler();

        if ($this->_errstr !== null || !$result) {
            #require_once 'Zend/Mail/Transport/Exception.php';
            throw new Zend_Mail_Transport_Exception('Unable to send mail. ' . $this->_errstr);
        }
    }

    protected function _prepareHeaders($headers)
    {
        if (!$this->_mail) {
            #require_once 'Zend/Mail/Transport/Exception.php';
            throw new Zend_Mail_Transport_Exception('_prepareHeaders requires a registered Zend_Mail object');
        }

        // mail() uses its $to parameter to set the To: header, and the $subject
        // parameter to set the Subject: header. We need to strip them out.
        if (0 === strpos(PHP_OS, 'WIN')) {
            // If the current recipients list is empty, throw an error
            if (empty($this->recipients)) {
                #require_once 'Zend/Mail/Transport/Exception.php';
                throw new Zend_Mail_Transport_Exception('Missing To addresses');
            }
        } else {
            // All others, simply grab the recipients and unset the To: header
            if (!isset($headers['To'])) {
                #require_once 'Zend/Mail/Transport/Exception.php';
                throw new Zend_Mail_Transport_Exception('Missing To header');
            }

            unset($headers['To']['append']);
            $this->recipients = implode(',', $headers['To']);
        }

        // Remove recipient header
        unset($headers['To']);

        // Remove subject header, if present
        if (isset($headers['Subject'])) {
            unset($headers['Subject']);
        }

        // Sanitize the From header
        if (isset($headers['From'])) {
            $addressList = array_filter($headers['From'], function ($key) {
                return $key !== 'append';
            }, ARRAY_FILTER_USE_KEY);
            foreach ($addressList as $address) {
                if (preg_match('/\\\"/', $address)) {
                    throw new Zend_Mail_Transport_Exception('Potential code injection in From header');
                }
            }
        }

        // Prepare headers
        parent::_prepareHeaders($headers);

        // Fix issue with empty blank line ontop when using Sendmail Trnasport
        $this->header = rtrim($this->header);
    }

    public function _handleMailErrors($errno, $errstr, $errfile = null, $errline = null, array $errcontext = null)
    {
        $this->_errstr = $errstr;
        return true;
    }

}