Translations:KMail/FAQs Hints and Tips/35/en
Now you have to look at that set of new icons at the top right, close to the search box, for 
- the tooltip says . Choose , then tab. There is a list of , and below that a mockup of column headers. Each one of those column headers needs to be clicked on, and your new Custom font set. At the end of this the message list will display in the same font as the rest of your layout.