Date constraint with Sieve Filtering

[Christophe Boyanique]

Hello,

I would like to know if it is possible to add date constraints in sieve 
rules ?

Something like that:

if "Date Sent" before 2005/04/30 and "Date Sent" after 2005/04/25 then 
send a vacation message ?

I found on the web indications about "Date Sent" and "Date Received" 
(are they headers ?) but no example and my attempts to hack scripts by 
myself went nowhere.

Christophe.
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