Emacs/emacs/Other-Mailbox-Formats
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33.20 Retrieving Mail from Local Mailboxes in Various Formats
If your incoming mail is stored on a local machine in a format other
than Unix mailbox, you will need the Mailutils movemail to
retrieve it. See Movemail, for the detailed description of
movemail versions. For example, to access mail from an inbox in
maildir format located in /var/spool/mail/in, you would
include the following in the Rmail inbox list:
maildir:///var/spool/mail/in
