CF7 чтобы файлы тоже приходили на почту.

function cf7_attachment_link($wpcf7) {
   $submission = WPCF7_Submission::get_instance();
   if ($submission) {
      $uploaded_files = $submission->uploaded_files();
      if (!empty($uploaded_files)) {
         $attachments = array();
         foreach ($uploaded_files as $fieldname => $uploaded_file) {
            $attachments[] = $uploaded_file;
         }
         $mail = $wpcf7->prop('mail');
         $mail['attachments'] = $attachments;
         $wpcf7->set_properties(array('mail' => $mail));
      }
   }
}
add_action('wpcf7_before_send_mail', 'cf7_attachment_link');