[Users] Some text rendered as =[0-9][0-9]

[David Niklas]

Hello,
When reading some posts to various mailing lists (digest mode) I often
run into sentences that are quoted and look like this:

> some text here and then=20
some more text down here
> Some=3Dthing else.

Other posts are full of things (exact quote):

> 01.09.2015 13:43, Wouter Verhelst =D0=BF=D0=B8=D1=88=D0=B5=D1=82:

What's going on and how do I fix it?
It almost looks like UTF-8 gone bad.

Thanks, David