Wanderlust is a mail reader for Emacs.

Wanderlust is a fast and powerful mail reader for Emacs that can store its mail on an IMAP server or locally (in MH or Maildir format). It has good support for multiple accounts, for internationalisation, and for composing and reading MIME-formatted e-mail.

Wanderlust is best installed from MELPA. It is maintained at http://github.com/wanderlust/wanderlust .