After more rigorous testing, I decided to swap to my other Jolla1 - on which the mail patch works flawlessly (I guess there is something adrift on my 1st Jolla1).

I offer the patch here and on TJC for testing and purposes of feedback. Please report all your findings here on this thread.

It works fine on my second device. It installs/applies/uninstalls without a hitch, the question is, does it do the job it was designed to do?.......I get all kinds of emails and so far, from what I can see, the background stays transparent, making emails much easier on the eyes, especially in the night/first thing in the morning.

PATCH: Transparent email background;

https://www.dropbox.com/s/qcyipsqbus...oarch.rpm?dl=0

Caution: Despite not finding any serious problems by using this patch, you use this file purely at your own risk.