Fix for Posts with a Featured Image not being sent in MailPress

There’s a bug somewhere in MailPress 5.3 that prevents posts from being sent in your newsletter if they contain a featured image. I’m not exactly sure why this happens, but it appears to be related to MailPress’s attempt to reproduce the TwentyTen theme’s evil habit of [intlink id=”988″ type=”post”]changing your site header according to a post’s featured image[/intlink].

Something seems to go wrong in the process; but given that you probably don’t want the image in the header of your emails to change according to a post’s featured image either, the simplest solution is to disable this buggy behaviour entirely. To do this, you need to edit the file mailpress/mp-includes/class/MP_theme_html_.class.php.

In the function header_image, delete or comment out these 3 lines:

//    case ( $post_id && function_exists('has_post_thumbnail') && function_exists('get_post_thumbnail_id') && function_exists('wp_get_attachment_image_src') && $post_id && has_post_thumbnail( $post_id ) && ($image = wp_get_attachment_image_src( get_post_thumbnail_id( $post_id ), 'post-thumbnail')) && ($image[1] >= self::HEADER_IMAGE_WIDTH) ) :
//        echo $image[0];
//    break;