GNU Emacs Manual - Rmail Scrolling

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## Scrolling Within a Message

When Rmail displays a message that does not fit on the screen, you must scroll through it to read the rest. You could do this with `C-v`, `M-v` and `M-<`, but in Rmail scrolling is so frequent that it deserves to be easier to type.

``SPC``
  Scroll forward (`scroll-up`).
``DEL``
  Scroll backward (`scroll-down`).
`.`
  Scroll to start of message (`rmail-beginning-of-message`).

Since the most common thing to do while reading a message is to scroll through it by screenfuls, Rmail makes `SPC` and `DEL` synonyms of `C-v` (`scroll-up`) and `M-v` (`scroll-down`)

The command `.` (`rmail-beginning-of-message`) scrolls back to the beginning of the selected message. This is not quite the same as `M-<`: for one thing, it does not set the mark; for another, it resets the buffer boundaries to the current message if you have changed them.

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