1) Belatedly announcing, in case folks missed it:
http://www1.ietf.org/internet-drafts/draft-elvey-refuse-sieve-02.txt
Last discussion post on 'refuse' was my post on 6/8/04.
I believe 'refuse' is ready for last call.
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2) http://wiki.fastmail.fm/wiki/index.php/SieveExtensionsSupportMatrix
might make a good addition to http://cyrusoft.com/sieve/.
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Matthew