Wanderlust is a mail/news agent on Emacs/XEmacs.

The features of Wanderlust are as follows:
 * Implementation in elisp only.
 * Support of IMAP4rev1, NNTP, POP(POP3/APOP) and MH format.
 * Integrated access to messages based on Folder Specifications like Mew.
 * Key bindings and mark processing like Mew.
 * Management of threads and unread messages.
 * Folder mode that displays all folder you read.
 * Message cache, Disconnected Operation.
 * MH-like FCC (FCC: %Backup is possible).
 * Support of MIME (by SEMI or tm).
 * Draft editing of mail and news as a same interface.
 * Icon based interface for the list of Folder (XEmacs).
 * Non-fetched operations for a big message part of MIME (IMAP4).
 * Server side search (IMAP4), also various charset support.
 * Virtual Folder.
 * Compression Folder.
 * Automatic expiration of old messages.

WWW: https://github.com/wanderlust/wanderlust