Duplicate e-mail with Dovecot and Sieve

[Claudio Corvino]

The "duplicate" test was removed because not working in this particular 
case, I already read the RFC but I didn't find anything useful for our case.

I'll try replacing `if true` with `if not duplicate` into sieve script 
and I'll post back the result.

The "true" check is used to enable the out of office rule, otherwise we 
use "if false # true" to disable it.

Thanks

-- 

*Claudio Corvino
IT Systems Administrator*

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