sieve VARIABLES extension -- when?

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Hello,

what is the progress, if any, implementing the VARIABLES extension to sieve? 
Google only turns this up:

> Ken Murchison | 2 Aug 15:49 2007
>
>
>       Re: Sieve variables draft support?
>
> Dale Ghent wrote:
> > Hey all. Just curious, are there any plans re: implementing the  
> > variables extension to Cyrus's implementation of Sieve?
>
> Yes, but I can't give you a firm time frame.
cheers,

Rob
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