scmail is a mail filter written in Scheme.  scmail can filter an
incoming mail when it is received and filter mails in a mailbox.

    * Written simply in Scheme.
    * scmail supports MH and Maildir mailboxes.
    * Simple filtering rules can be written in S-expressions.
    * Advanced filtering rules can be written in Scheme programs.
    * scmail can filter an incoming mail when it is received (like procmail).
    * scmail can filter mails in a mailbox.
    * spam filter (scbayes) is included. (now testing)

WWW: http://www.namazu.org/~satoru/scmail/