our whole WordPress site is setup so that we are rewriting everything pointing to
/plugins/. This has been working very well so far, is registered with the internal rewrite rules and even the WP function
plugins_url() works towards that.
Now, a lot of the newsletter specific links point towards
/wp-content/plugins/newsletter/ instead of the much simpler
/plugins/newsletter/. Can it be that the whole
/wp-content/-part is hardcoded?