How do I change email formatting?

I did *something* while editing an email, and now every single email I
receive, plain text or HTML, has a hanging-indent format. It's really ugly,
and I've looked everywhere and cannot figure out how to fix it. For a while,
all my new emails and replies were also formatted this way, but I managed to
change the normal style back to normal, and finally got those to go away (by
reformatting and sending successfully). But how do I get all received email
to just be normal, rather than having an ugly hanging indent? (yes, I use
Word as my email editor)