Pigeonhole is the name of the project that adds support for
the Sieve language (RFC 5228) and the ManageSieve protocol
(RFC 5804) to the Dovecot Secure IMAP/POP3 Server.

Requires: dovecot

Configuration:
sieve and managesieve config files are placed with dovecot
documentation.  Copy over 20-managesieve.conf and 90-sieve.conf
to /etc/dovecot/conf.d and edit accordingly.

For additional configuration help, see:

http://wiki2.dovecot.org/Pigeonhole/Sieve
http://wiki2.dovecot.org/Pigeonhole/ManageSieve