[Dovecot] Duplicate suppression

[Thiago Henrique]

Hello,

In a Dovecot 2.0.6 server I have an account x at domain and an alias
y at domain -> x at domain.

When I send an email to x at domain with carbon copy to y at domain, X
receives two messages on mailbox. Dovecot2 has any feature of duplicate
suppression ?

Thanks, 
Thiago Henrique