(Rmail Sorting): Add the keybindings associated with each
sort command. Fix `rmail-sort-by-labels' name. Mention sorting from summary. Mention sorts cannot be undone. (Rmail Display): Give an example of how to use goto-address-mode. (Rmail Editing): It's keybindings that are redefined, not commands. Fix some typos. (Movemail): Some minor rewording. (Remote Mailboxes): Emacs movemail supports pop by default. Fix some minor grammatical issues. The "two alternative ways" to specify a POP mailbox are really just one. Remove all reference to the variables rmail-pop-password and rmail-pop-password-required, obsolete since Emacs 22.1. Clarify the four password steps. Emacs movemail can support Kerberos.
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