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(message)Buffer Entry

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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.