Ned Freed said...
AFAIK nobodhy is talking about not allowing this. The question is 
whether or
not we should specify all of the nuances involved in supporting this 
mode of
operation, and if we're going to whether or not this is the right place 
to do
it. I remain to be convinced of the need to specify this and I'm opposed to
doing it in this document.
Where to do it is, I think, the key point.  And so I'll point out that 
Randy Gellens has a draft in lemonade, currently called "Notifications 
Architecture": 
http://tools.ietf.org/wg/lemonade/draft-ietf-lemonade-notifications/
The plan is to fold some Sieve-related stuff into it and perhaps rename 
it to "Notifications and Filter Architecture".  That might be a 
reasonable place to put this sort of discussion.
Barry