On 18.1.2013, at 17.36, 3.lis...@adminlinux.com.br <lis...@adminlinux.com.br> 
wrote:

> In a Dovecot 2.0.6 server I have an account x@domain and an alias
> y@domain -> x@domain.
> 
> When I send an email to x@domain with carbon copy to y@domain, X
> receives two messages on mailbox. Dovecot2 has any feature of duplicate
> suppression ?

With v2.1 + Pigeonhole 0.3.1+ you can use vnd.dovecot.duplicate extension.

http://www.ietf.org/id/draft-bosch-sieve-duplicate-00.txt

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