Fault in font in message body in KMail

KMail on TDE 3.5.13.2 on Wheezy, all fully updated. Because my husband had an eye operation today I wanted to enlarge everything in KMail for him. I cannot enlarge the text in the message body. After about ten tries the font changed from serif to sans-serif, but that is all. When I change the message body setting, the headers change, be they long or short - but he doesn't want to read those. The text of the email remains stubbornly tiny. The date in the message list also fails to change font. The rest changes! I have tried to have everything fully updated, but am getting: <normal updating> Err http://ppa.quickbuild.pearsoncomputing.net wheezy Release.gpg Could not connect to ppa.quickbuild.pearsoncomputing.net:80 (108.166.152.51), connection timed out Fetched 935 kB in 2min 0s (7,762 B/s) W: Failed to fetch http://ppa.quickbuild.pearsoncomputing.net/slavek-banko/axis/ubuntu/dists/w…: Could not connect to ppa.quickbuild.pearsoncomputing.net:80 (108.166.152.51), connection timed out W: Some index files failed to download. They have been ignored, or old ones used instead. <continue normal updating> Sources.list: (The inappropriate wrapping is not in the sources.list file, only here) <quote> deb http://ftp.uk.debian.org/debian wheezy main contrib non-free deb-src http://ftp.uk.debian.org/debian wheezy main contrib non-free deb http://ftp.debian.org/debian/ wheezy-updates main contrib non-free deb-src http://ftp.debian.org/debian/ wheezy-updates main contrib non-free deb http://security.debian.org/ wheezy/updates main contrib non-free deb-src http://security.debian.org/ wheezy/updates main contrib non-free deb http://ftp.at.debian.org/debian wheezy-backports main contrib non-free deb http://mozilla.debian.net wheezy-backports iceweasel-release deb http://www.deb-multimedia.org wheezy main non-free # deb http://depot-trinity.dotriver.eu/trinity-v3.5.13/debian wheezy main # deb http://depot-trinity.dotriver.eu/trinity-builddeps-v3.5.13/debian wheezy main deb http://mirror.ntmm.org/trinity/trinity-v3.5.13/debian wheezy main deb http://mirror.ntmm.org/trinity/trinity-builddeps-v3.5.13/debian wheezy main deb http://ppa.quickbuild.pearsoncomputing.net/slavek-banko/axis/ubuntu wheezy main </quote> Suggestions, please! The poor man can't read at the moment - and he now can't easily keep up with his email either! The eye problem is only temporary, so I would like to solve this fast! I wondered about just reinstalling KMail, but don't want to mess up his mail. Lisi