You can only change it when you are actually composing an email and it will revert back to the default settings after you have sent the email. the settings to change it are in the menu bar of the email you are composing.
Hi - I've tried changing the font and size when composing messages but it just reverts to normal as soon as I start typing. It seems ridiculous not to be able to change and save the font type and size for the e mail package. Doing this for each message will be a real pain and the normal setting can be difficult to read for older people like myself. The old system was much better in this respect.
Just barging in here, hope that's okay.
I also have this question/problem of how to save the font as a preference rather than having to specify it every time; the novelty wears off after about one email.
Also using the webmail version on a Macbook.
All the best,