Since upgrading to Civi 4.7.15 CKEditor is stripping out the email headers and style tags on three Drupal 7 sites. One site is hosted on a shared/multi-site and the other two on AegirVPS.
This problem may have first surfaced in 4.7.14. (See this similar post about Joomla)
I have set both config.fullPage and config.allowedContent to true using the configurator, and the changes are reflected in the config files in files/civicrm/persist (crm-ckeditor-civimail.js and crm-ckeditor-default.js).
The changes aren't reflecting in the editor (I also removed some buttons which also still appear in the editor).
I have cleared Drupal, Civi and browser caches, deactivated JS aggregation, and tested on Chrome and Firefox without joy.
When I click the source button the full email flashes briefly but then strips out the tags.
Is there something I'm missing? / Can anyone suggest another solution? @Coleman?