Hi,
We have show_additional_headers 1.0 installed and activated, but due to some reason it does for instance not show the headers "Content-Type" and "Content-Transfer-Encoding". It shows "User-Agent", "Mailer", "X-Newsreader" and the like, though.
As you may have noticed, it's called "show_additional_headers", not "show_all_headers". ;-)
There is a version 1.1 available at http://trac.roundcube.net/browser/trunk/plugins/show_additional_headers?rev=... 764, can this be safely used with RC 0.7.2? And does it behave differently in this respect?
Looking at the comments at the beginning of this file, I see that an option exists to configure which headers should be shown:
Maybe you give it a try.
-Martin