Changing Email Font

I know that there is supposed to be the ability to change the default font in email settings but even after chaging it, the beginning of a new email shows as Verdana 11pt not Arial 10pt as I want it to be.

I have gone into Email Settings, Compose and made the changes to Arial 10pt but when I next try to compoase an email, it still shows the Verdana 11pt font in the body of the email.

Can anyone assist.