Uma classe completa para envio de e-mail.
Muito fácil de entender.
Tem código pronto para envio de mensagem com arquivo anexo.
É isso ae!

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<?php

  class email {
    var $html;
    var $text;
    var $output;
    var $html_text;
    var $html_images;
    var $image_types;
    var $build_params;
    var $attachments;
    var $headers;

    function email($headers = '') {
      if ($headers == '') $headers = array();

      $this->html_images = array();
      $this->headers = array();

      if (EMAIL_LINEFEED == 'CRLF') {
        $this->lf = "\r\n";
      } else {
        $this->lf = "\n";
      }

/**
 * If you want the auto load functionality
 * to find other mime-image/file types, add the
 * extension and content type here.
 */

      $this->image_types = array('gif' => 'image/gif',
                                 'jpg' => 'image/jpeg',
                                 'jpeg' => 'image/jpeg',
                                 'jpe' => 'image/jpeg',
                                 'bmp' => 'image/bmp',
                                 'png' => 'image/png',
                                 'tif' => 'image/tiff',
                                 'tiff' => 'image/tiff',
                                 'swf' => 'application/x-shockwave-flash');

      $this->build_params['html_encoding'] = 'quoted-printable';
      $this->build_params['text_encoding'] = '7bit';
      $this->build_params['html_charset'] = constant('CHARSET');
      $this->build_params['text_charset'] = constant('CHARSET');
      $this->build_params['text_wrap'] = 998;

/**
 * Make sure the MIME version header is first.
 */

      $this->headers[] = 'MIME-Version: 1.0';

      reset($headers);
      while (list(,$value) = each($headers)) {
        if (tep_not_null($value)) {
          $this->headers[] = $value;
        }
      }
    }

/**
 * This function will read a file in
 * from a supplied filename and return
 * it. This can then be given as the first
 * argument of the the functions
 * add_html_image() or add_attachment().
 */

    function get_file($filename) {
      $return = '';

      if ($fp = fopen($filename, 'rb')) {
        while (!feof($fp)) {
          $return .= fread($fp, 1024);
        }
        fclose($fp);

        return $return;
      } else {
        return false;
      }
    }

/**
 * Function for extracting images from
 * html source. This function will look
 * through the html code supplied by add_html()
 * and find any file that ends in one of the
 * extensions defined in $obj->image_types.
 * If the file exists it will read it in and
 * embed it, (not an attachment).
 *
 * Function contributed by Dan Allen
 */

    function find_html_images($images_dir) {
// Build the list of image extensions
      while (list($key, ) = each($this->image_types)) {
        $extensions[] = $key;
      }

      preg_match_all('/"([^"]+\.(' . implode('|', $extensions).'))"/Ui', $this->html, $images);

      for ($i=0; $i<count($images[1]); $i++) {
        if (file_exists($images_dir . $images[1][$i])) {
          $html_images[] = $images[1][$i];
          $this->html = str_replace($images[1][$i], basename($images[1][$i]), $this->html);
        }
      }

      if (tep_not_null($html_images)) {
// If duplicate images are embedded, they may show up as attachments, so remove them.
        $html_images = array_unique($html_images);
        sort($html_images);

        for ($i=0; $i<count($html_images); $i++) {
          if ($image = $this->get_file($images_dir . $html_images[$i])) {
            $content_type = $this->image_types[substr($html_images[$i], strrpos($html_images[$i], '.') + 1)];
            $this->add_html_image($image, basename($html_images[$i]), $content_type);
          }
        }
      }
    }

/**
 * Adds plain text. Use this function
 * when NOT sending html email
 */

    function add_text($text = '') {
      $this->text = tep_convert_linefeeds(array("\r\n", "\n", "\r"), $this->lf, $text);
    }

/**
 * Adds a html part to the mail.
 * Also replaces image names with
 * content-id's.
 */

    function add_html($html, $text = NULL, $images_dir = NULL) {
      $this->html = tep_convert_linefeeds(array("\r\n", "\n", "\r"), '<br />', $html);
      $this->html_text = tep_convert_linefeeds(array("\r\n", "\n", "\r"), $this->lf, $text);

      if (isset($images_dir)) $this->find_html_images($images_dir);
    }

/**
 * Adds an image to the list of embedded
 * images.
 */

    function add_html_image($file, $name = '', $c_type='application/octet-stream') {
      $this->html_images[] = array('body' => $file,
                                   'name' => $name,
                                   'c_type' => $c_type,
                                   'cid' => md5(uniqid(time())));
    }

/**
 * Adds a file to the list of attachments.
 */

    function add_attachment($file, $name = '', $c_type='application/octet-stream', $encoding = 'base64') {
      $this->attachments[] = array('body' => $file,
                                   'name' => $name,
                                   'c_type' => $c_type,
                                   'encoding' => $encoding);
    }

/**
 * Adds a text subpart to a mime_part object
 */

/* HPDL PHP3 */
//    function &add_text_part(&$obj, $text) {
    function add_text_part(&$obj, $text) {
      $params['content_type'] = 'text/plain';
      $params['encoding'] = $this->build_params['text_encoding'];
      $params['charset'] = $this->build_params['text_charset'];

      if (is_object($obj)) {
        return $obj->addSubpart($text, $params);
      } else {
        return new mime($text, $params);
      }
    }

/**
 * Adds a html subpart to a mime_part object
 */

/* HPDL PHP3 */
//    function &add_html_part(&$obj) {
    function add_html_part(&$obj) {
      $params['content_type'] = 'text/html';
      $params['encoding'] = $this->build_params['html_encoding'];
      $params['charset'] = $this->build_params['html_charset'];

      if (is_object($obj)) {
        return $obj->addSubpart($this->html, $params);
      } else {
        return new mime($this->html, $params);
      }
    }

/**
 * Starts a message with a mixed part
 */

/* HPDL PHP3 */
//    function &add_mixed_part() {
    function add_mixed_part() {
      $params['content_type'] = 'multipart/mixed';

      return new mime('', $params);
    }

/**
 * Adds an alternative part to a mime_part object
 */

/* HPDL PHP3 */
//    function &add_alternative_part(&$obj) {
    function add_alternative_part(&$obj) {
      $params['content_type'] = 'multipart/alternative';

      if (is_object($obj)) {
        return $obj->addSubpart('', $params);
      } else {
        return new mime('', $params);
      }
    }

/**
 * Adds a html subpart to a mime_part object
 */

/* HPDL PHP3 */
//    function &add_related_part(&$obj) {
    function add_related_part(&$obj) {
      $params['content_type'] = 'multipart/related';

      if (is_object($obj)) {
        return $obj->addSubpart('', $params);
      } else {
        return new mime('', $params);
      }
    }

/**
 * Adds an html image subpart to a mime_part object
 */

/* HPDL PHP3 */
//    function &add_html_image_part(&$obj, $value) {
    function add_html_image_part(&$obj, $value) {
      $params['content_type'] = $value['c_type'];
      $params['encoding'] = 'base64';
      $params['disposition'] = 'inline';
      $params['dfilename'] = $value['name'];
      $params['cid'] = $value['cid'];

      $obj->addSubpart($value['body'], $params);
    }

/**
 * Adds an attachment subpart to a mime_part object
 */

/* HPDL PHP3 */
//    function &add_attachment_part(&$obj, $value) {
    function add_attachment_part(&$obj, $value) {
      $params['content_type'] = $value['c_type'];
      $params['encoding'] = $value['encoding'];
      $params['disposition'] = 'attachment';
      $params['dfilename'] = $value['name'];

      $obj->addSubpart($value['body'], $params);
    }

/**
 * Builds the multipart message from the
 * list ($this->_parts). $params is an
 * array of parameters that shape the building
 * of the message. Currently supported are:
 *
 * $params['html_encoding'] - The type of encoding to use on html. Valid options are
 *                            "7bit", "quoted-printable" or "base64" (all without quotes).
 *                            7bit is EXPRESSLY NOT RECOMMENDED. Default is quoted-printable
 * $params['text_encoding'] - The type of encoding to use on plain text Valid options are
 *                            "7bit", "quoted-printable" or "base64" (all without quotes).
 *                            Default is 7bit
 * $params['text_wrap']     - The character count at which to wrap 7bit encoded data.
 *                            Default this is 998.
 * $params['html_charset']  - The character set to use for a html section.
 *                            Default is iso-8859-1
 * $params['text_charset']  - The character set to use for a text section.
 *                          - Default is iso-8859-1
 */

/* HPDL PHP3 */
//    function build_message($params = array()) {
    function build_message($params = '') {
      if ($params == '') $params = array();

      if (count($params) > 0) {
        reset($params);
        while(list($key, $value) = each($params)) {
          $this->build_params[$key] = $value;
        }
      }

      if (tep_not_null($this->html_images)) {
        reset($this->html_images);
        while (list(,$value) = each($this->html_images)) {
          $this->html = str_replace($value['name'], 'cid:' . $value['cid'], $this->html);
        }
      }

      $null = NULL;
      $attachments = ((tep_not_null($this->attachments)) ? true : false);
      $html_images = ((tep_not_null($this->html_images)) ? true : false);
      $html = ((tep_not_null($this->html)) ? true : false);
      $text = ((tep_not_null($this->text)) ? true : false);

      switch (true) {
        case (($text == true) && ($attachments == false)):
/* HPDL PHP3 */
//          $message =& $this->add_text_part($null, $this->text);
          $message = $this->add_text_part($null, $this->text);
          break;
        case (($text == false) && ($attachments == true) && ($html == false)):
/* HPDL PHP3 */
//          $message =& $this->add_mixed_part();
          $message = $this->add_mixed_part();

          for ($i=0; $i<count($this->attachments); $i++) {
            $this->add_attachment_part($message, $this->attachments[$i]);
          }
          break;
        case (($text == true) && ($attachments == true)):
/* HPDL PHP3 */
//          $message =& $this->add_mixed_part();
          $message = $this->add_mixed_part();
          $this->add_text_part($message, $this->text);

          for ($i=0; $i<count($this->attachments); $i++) {
            $this->add_attachment_part($message, $this->attachments[$i]);
          }
          break;
        case (($html == true) && ($attachments == false) && ($html_images == false)):
          if (tep_not_null($this->html_text)) {
/* HPDL PHP3 */
//            $message =& $this->add_alternative_part($null);
            $message = $this->add_alternative_part($null);
            $this->add_text_part($message, $this->html_text);
            $this->add_html_part($message);
          } else {
/* HPDL PHP3 */
//            $message =& $this->add_html_part($null);
            $message = $this->add_html_part($null);
          }
          break;
        case (($html == true) && ($attachments == false) && ($html_images == true)):
          if (tep_not_null($this->html_text)) {
/* HPDL PHP3 */
//            $message =& $this->add_alternative_part($null);
            $message = $this->add_alternative_part($null);
            $this->add_text_part($message, $this->html_text);
/* HPDL PHP3 */
//            $related =& $this->add_related_part($message);
            $related = $this->add_related_part($message);
          } else {
/* HPDL PHP3 */
//            $message =& $this->add_related_part($null);
//            $related =& $message;
            $message = $this->add_related_part($null);
            $related = $message;
          }
          $this->add_html_part($related);

          for ($i=0; $i<count($this->html_images); $i++) {
            $this->add_html_image_part($related, $this->html_images[$i]);
          }
          break;
        case (($html == true) && ($attachments == true) && ($html_images == false)):
/* HPDL PHP3 */
//          $message =& $this->add_mixed_part();
          $message = $this->add_mixed_part();
          if (tep_not_null($this->html_text)) {
/* HPDL PHP3 */
//            $alt =& $this->add_alternative_part($message);
            $alt = $this->add_alternative_part($message);
            $this->add_text_part($alt, $this->html_text);
            $this->add_html_part($alt);
          } else {
            $this->add_html_part($message);
          }

          for ($i=0; $i<count($this->attachments); $i++) {
            $this->add_attachment_part($message, $this->attachments[$i]);
          }
          break;
        case (($html == true) && ($attachments == true) && ($html_images == true)):
/* HPDL PHP3 */
//          $message =& $this->add_mixed_part();
          $message = $this->add_mixed_part();

          if (tep_not_null($this->html_text)) {
/* HPDL PHP3 */
//            $alt =& $this->add_alternative_part($message);
            $alt = $this->add_alternative_part($message);
            $this->add_text_part($alt, $this->html_text);
/* HPDL PHP3 */
//            $rel =& $this->add_related_part($alt);
            $rel = $this->add_related_part($alt);
          } else {
/* HPDL PHP3 */
//            $rel =& $this->add_related_part($message);
            $rel = $this->add_related_part($message);
          }
          $this->add_html_part($rel);

          for ($i=0; $i<count($this->html_images); $i++) {
            $this->add_html_image_part($rel, $this->html_images[$i]);
          }

          for ($i=0; $i<count($this->attachments); $i++) {
            $this->add_attachment_part($message, $this->attachments[$i]);
          }
          break;
      }

      if ( (isset($message)) && (is_object($message)) ) {
        $output = $message->encode();
        $this->output = $output['body'];

        reset($output['headers']);
        while (list($key, $value) = each($output['headers'])) {
          $headers[] = $key . ': ' . $value;
        }

        $this->headers = array_merge($this->headers, $headers);

        return true;
      } else {
        return false;
      }
    }

/**
 * Sends the mail.
 */

    function send($to_name, $to_addr, $from_name, $from_addr, $subject = '', $headers = '') {
      $to = (($to_name != '') ? '"' . $to_name . '" <' . $to_addr . '>' : $to_addr);
      $from = (($from_name != '') ? '"' . $from_name . '" <' . $from_addr . '>' : $from_addr);

      if (is_string($headers)) {
        $headers = explode($this->lf, trim($headers));
      }

      for ($i=0; $i<count($headers); $i++) {
        if (is_array($headers[$i])) {
          for ($j=0; $j<count($headers[$i]); $j++) {
            if ($headers[$i][$j] != '') {
              $xtra_headers[] = $headers[$i][$j];
            }
          }
        }

        if ($headers[$i] != '') {
          $xtra_headers[] = $headers[$i];
        }
      }

      if (!isset($xtra_headers)) {
        $xtra_headers = array();
      }

      if (EMAIL_TRANSPORT == 'smtp') {
        return mail($to_addr, $subject, $this->output, 'From: ' . $from . $this->lf . 'To: ' . $to . $this->lf . implode($this->lf, $this->headers) . $this->lf . implode($this->lf, $xtra_headers));
      } else {
        return mail($to, $subject, $this->output, 'From: '.$from.$this->lf.implode($this->lf, $this->headers).$this->lf.implode($this->lf, $xtra_headers));
      }
    }

/**
 * Use this method to return the email
 * in message/rfc822 format. Useful for
 * adding an email to another email as
 * an attachment. there's a commented
 * out example in example.php.
 *
 * string get_rfc822(string To name,
 *       string To email,
 *       string From name,
 *       string From email,
 *       [string Subject,
 *        string Extra headers])
 */

    function get_rfc822($to_name, $to_addr, $from_name, $from_addr, $subject = '', $headers = '') {
// Make up the date header as according to RFC822
      $date = 'Date: ' . date('D, d M y H:i:s');
      $to = (($to_name != '') ? 'To: "' . $to_name . '" <' . $to_addr . '>' : 'To: ' . $to_addr);
      $from = (($from_name != '') ? 'From: "' . $from_name . '" <' . $from_addr . '>' : 'From: ' . $from_addr);

      if (is_string($subject)) {
        $subject = 'Subject: ' . $subject;
      }

      if (is_string($headers)) {
        $headers = explode($this->lf, trim($headers));
      }

      for ($i=0; $i<count($headers); $i++) {
        if (is_array($headers[$i])) {
          for ($j=0; $j<count($headers[$i]); $j++) {
            if ($headers[$i][$j] != '') {
              $xtra_headers[] = $headers[$i][$j];
            }
          }
        }

        if ($headers[$i] != '') {
          $xtra_headers[] = $headers[$i];
        }
      }

      if (!isset($xtra_headers)) {
        $xtra_headers = array();
      }

      $headers = array_merge($this->headers, $xtra_headers);

      return $date . $this->lf . $from . $this->lf . $to . $this->lf . $subject . $this->lf . implode($this->lf, $headers) . $this->lf . $this->lf . $this->output;
    }
  }
?>

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