rccservice

Right, sorry forgot to post the filename where the piece of code is from. It’s from the mail.php from cf7 (fullpath: ‘yourwp-home’\wp-content\plugins\contact-form-7\includes\mail.php). I know this originates in CF7, but if people have this problem they will look here for a solution.

Found the problem and a solution:
These lines of code are the culprits:

????????????????if ( ! wpcf7_is_file_path_in_content_dir( $path ) ) {
????????????????????if ( WP_DEBUG ) {
????????????????????????trigger_error(
????????????????????????????sprintf(
????????????????????????????????/* translators: %s: Attachment file path.?
????????????????????????????????__( ‘Failed to attach a file. %s is not in the allowed directory.’, ‘contact-form-7’ ),
????????????????????????????????$path
????????????????????????????),
????????????????????????????E_USER_NOTICE
????????????????????????);
????????????????????}

????????????????????return false;
????????????????}

As far as I can see these lines do nothing useful, because there is a check if the folder is writeable a few lines later.

After some digging I found that the PDF file gets generated, the mail gets sent but the PDF isn’t attached to it.