如果不含圖檔:
 $mail = new html_mime_mail();
 $html ="HTML內容";
 $mail->add_html($html, $text);
 $mail->build_message();
 $mail->send(收信人,收信Email,發信人,發信Email,標題,額外Header);

--------------------------------------------------------------------------------
如果含圖檔:
$url="www.cuti.com.my/AD/";//圖檔位址 開頭無http:// 結尾有斜線
$path="/MAIL/AD/";//圖檔路徑 結尾有斜線

$filename1 = 'a.jpg';
$backgrnd1 = fread($fp = fopen($path.$filename1, 'r'), filesize($path.$filename1));
fclose($fp);
...依此類推...
$filename6 = 'f.gif';
$backgrnd6 = fread($fp = fopen($path.$filename6, 'r'), filesize($path.$filename6));
fclose($fp);

$mail->add_html_image($backgrnd1,$filename1,'image/jpeg','http://'.$url.$filename1);
...依此類推...
$mail->add_html_image($backgrnd6,$filename6,'image/gif','http://'.$url.$filename6);

 $mail = new html_mime_mail();
 $html ="HTML含圖內容";
 $mail->add_html($html, $text);
 $mail->build_message();
 $mail->send(收信人,收信Email,發信人,發信Email,標題,額外Header);