The major mode used in the mail buffer is Mail mode, which is much like Text mode except that various special commands are provided on the C-c prefix. These commands all have to do specifically with editing or sending the message. In addition, Mail mode defines the character `%' as a word separator; this is helpful for using the word commands to edit mail addresses.
Mail mode is normally used in buffers set up automatically by the
mail command and related commands. However, you can also switch
to Mail mode in a file-visiting buffer. That is a useful thing to do if
you have saved draft message text in a file.
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