FONTS changing in Yahoo mail

How do I change the fonts when I want to print a yahoo e-mail message? The letters are coming in in a readable format, but when I try to print, the letters are the smallest possible....
WHY? How do I change letters to normal size?? THANK YOU!

 

G'DAy "Keokia ",

When Yahoo Messenger is open, click on "Messenger" menu -> then 'Preferences" -> then when in preferences click on "Appearance" where you will find the "Change Fonts & Colors... "

pcbugfixer

 

the difference a few letters make (see colors)

I am unwilling to test this theory myself but you might want to try stylish for your EMAIL printing issue:
https://addons.mozilla.org/en-US/firefox/addon/2108

and solicit stylish stylist help
http://userstyles.org