font size changes when writing an e-mail
When writing an e-mail the font size will sometimes change when moving to the next line of text. It's always smaller.
When writing an e-mail the font size will sometimes change when moving to the next line of text. It's always smaller.
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Sounds like you may be possibly inadvertently making Tbird think that you are entering into the space known | treated as a signature (which is smaller often times and uses the 'pre-formatted' font sizing.
Consider checking / modifying the `Global Composition Preferences' for that account / profile to reset / change this behavior globally for that account.