Fixed width font in kmail

[Kolja Brix <Brix@physik.rwth-aachen.de>]

Hello alltogether!

For viewing and composing kmail messages on my Debian Potato, I would like to 
use a fixed width font (becaus of some tables in my mails).

I tried "sony-fixed" but this looks extremely ugly especially when a mail 
contains HTML code. Then the font is very big and it looks like on a dot 
display (I can send you a screenshot, if it helps).

I did not find any other font to use... What is wrong with my preferences? 
What can I do?

Thank you in advance for your help!

-- 
             ,_, 
Tschö,      (o,o)
 Kolja      {`"'}
            -"-"-