The Sieve Working Group web page at IETF is the authoritative home of the Working Group, describing the group's goals, milestones and providing all related RFCs and Internet Drafts.
The tools.ietf.org Sieve WG page shows up-to-date status of various WG drafts.
At sieve.info, we have compiled a list of documents with essential information about the published RFCs and internet drafts. However, refer to the pages above for accurate, up-to-date information.
Internet drafts on Sieve are discussed on the MTA Filters mailing list at sieve (@) ietf.org.
More information on the mailing list along with an archive of back messages is available at https://www.ietf.org/mailman/listinfo/sieve .