message: Buffer Entry
2.1 Buffer Entry
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You most often end up in a Message buffer when responding to some other
message of some sort. Message does lots of handling of quoted text, and
may remove signatures, reformat the text, or the like—depending on which
used settings you’re using. Message usually gets things right, but
sometimes it stumbles. To help the user unwind these stumblings,
Message sets the undo boundary before each major automatic action it
takes. If you press the undo key (usually located at ‘C-_’) a few
times, you will get back the un-edited message you’re responding to.