Download: http://www.courier-mta.org/download.php#maildrop
# This release is also available via BitTorrent. This is mostly an
# academical excersize, SourceForge's resources are as healthy as ever. The
# .torrent is created only to test my BitTorrent publication script (see
# http://eztorrent.courier-mta.com).
• Version 2.0 of maildrop introduces a new pattern matching engine that uses
the PCRE library, that uses a completely different syntax. However, very few
changes should be required to upgrade existing maildrop recipes to the new
syntax.
Review the maildropfilter manual page which has been revised to document the
new pattern matching syntax. The legacy pattern matching engine is still
available by setting MAILDROP_OLD_REGEXP to 1. See also the "Conversion of
maildrop 1.x patterns to 2.0" section in the manual page, for more
information.
• mailbot: Do not autoreply to messages with an Auto-Submitted: header,
unless it's contents are "no"; and add Auto-Submitted: header on
autoreplies.