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);