A variety of delivery-time mechanisms for filtering and disposing of messages have long been available for messages delivered via SMTP. Such filtering schemes have become increasingly important with the advent of increased volumes of mail and newer Internet-standard mail access models with richer delivery capabilities. In this increasingly complex delivery loop, it is desirable to have an architecture-independent, interoperable filtering language for use in the MTA delivery process written and adopted as an Internet Standard. The working group will specify a simplified but generalizable mail filtering language for filtering messages at the time of final delivery. It is designed to be independent of protocol, though clearly appropriate to RFC822/821 message handling, and implementable on either a mail client or mail server, though specifically intended for MTA delivery-side functionality.  It is meant to be extensible, simple, and independent of access protocol, mail architecture, and operating system. Because there has been considerable past work on specific MTA Filtering proposals, specifically the SIEVE draft, and there is a considerable body of working implementation experience in this area, the proposed Working Group anticipates fully completing the proposed Internet Standard in a relatively timely manner as reflected in the goals and milestones.