Sieve IMAPSieve (sieve-imapsieve) Plugin
IMAPSieve (RFC 6785) defines the use of Sieve filtering in IMAP, operating when messages are created or their attributes are changed.
The sieve_imapsieve
plugin implements the imapsieve
extension for the Sieve filtering language, adding functionality for using Sieve scripts from within IMAP.
TIP
Full details about this plugin can be found at imap-sieve plugin.