The sieve mail filtering language specified in RFC 3028 has now been implemented in a wide variety of user agents (UAs), mail delivery agents (MDAs), and mail transfer agents (MTAs). Several extensions have been specified (RFCs 3431, 3598, 3685, 3894) and have also been widely implemented. Several additional sieve extensions have been defined in various internet-drafts. All of these documents are individual submissions; up to this point work on sieve has been done informally and not under the auspices of any IETF working group. The sieve working group is being chartered to: (1) Revise the base sieve specification, RFC 3028, with the intention of moving it to draft standard. Substantive additions or revisions to the base specification are out of scope of this working group. However, the need to loosen current restrictions on side effects of tests as well as the need for a normative reference to the newly-defined comparators registry may necessitate a recycle at proposed. (2) Produce updated sieve relational (RFC 3431), subaddress (RFC 3598), spamtest/virustest (RFC 3685), and copy (RFC 3894) extension specifications, again with the intention of making a move to draft standard possible. It may be necessary to recycle some or all of these documents at proposed, depending on the scope of any changes. (3) Finalize and publish the sieve extensions as proposed standards: (a) Variables (draft-homme-sieve-variables-04.txt) (b) Vacation action (draft-showalter-sieve-vacation-05.txt) (c) Message body tests (draft-degener-sieve-body-02.txt) (d) Regular expressions (draft-murchison-sieve-regex-07.txt) (e) MIME part tests (draft-daboo-sieve-mime-00.txt) (f) Notification action (draft-martin-sieve-notify-02.txt) (g) IMAP flags (draft-melnikov-sieve-imapflags-06.txt) (h) Header editing actions (draft-degener-sieve-editheader-01.txt) (i) Reject before delivery (draft-elvey-refuse-sieve-01.txt) Additional drafts may be added this list, but only via a charter revision. There must also be demonstrable willingness in the sieve development community to actually implement a given extension before it can be added to this charter. Some aspects of sieve have complex internationalization issues; the working group will seek out internationalization expertise as needed to complete its work.