Re: Printing an Email...

> every now and then it is necessary to print an Email.
> Doing this from KMail leaves an unsatifying experience: Even if it is plain text, the fonts and the whole text looks blurred.

I can confirm this. Already in the print preview, the fuzziness is visible. It is indeed unacceptably bad.

> Is there anything that I as a user can do to improve this?

Export to pdf (or print to pdf) and then print. That gives proper results.

> Or is it a development issue?

Yes: https://bugs.kde.org/show_bug.cgi?id=422095