Changeable Font size in e-mail signatures


Would it be possible to implement some way we can change the font size in e-mail signatures?

I already saw, that HTML isn’t possible due to security concerns, but wouldn’t it be possible to use, for example, a BB-Code within the UI, which gets than transformed by the system to an HTML-Code inside the outgoing Mail?

This would be really helpful because we need to include a legal notice in the mails, which is quite large in normal font size and therefor pretty annoying.