[Users] Address problem

[Removed GDPR]

> Another problem is the colored text in the received messages, I need
> to have everything in white text on a black background due to my color
> perception problems. I can make out the 'red' spelling errors but the
> blue text in the body is unreadable. Can I change this?

Turn off:

Preferences > Display > Colors > Other > Enable coloration of message
text

Then you will have everything black on white. No idea about white on black.