is the flexible built-in message reader in Emacs. It supports reading and composing both news and mail. It can also use web-based sources as inputs for its groups.

Gnus is a news and mail reader. It can display messages from a variety of sources, called "select methods", including:

  • newsgroups from an NNTP server
  • newsgroups from a local spool
  • mail from a local directory (mbox, maildir etc supported)
  • mail from an IMAP server

A stable version of Gnus is included in Emacs. Gnus is developed in a separate repository, which is regularly synced with Emacs.

The Gnus manual is accessible from Emacs' Info facility, but can also be read online.

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