Packages with the sieve use flag

mail-client / claws-mail : An email client (and news reader) based on GTK+

  • Build plugin for sieve filter support

net-mail / cyrus-imapd : The Cyrus IMAP Server

  • Enable sieve support

net-mail / dbmail : Fast and scalable sql based email services

  • Enable sieve filter support

net-mail / dovecot : An IMAP and POP3 server written with security primarily in mind

  • Add sieve support

sci-mathematics / yafu : Yet another factoring utility

  • Use msieve for the sieving steps of NFS