Sieve duplicate detection not working as expected

Hi,

On a dovecot server (2.3.21) I have a simple sieve script:

require ["duplicate"]; # rule:[duplicate] if duplicate { discard; stop; }

I use virtual users with mail aliases on a LDAP backend.

I have user "resposit" having 2 mail aliases:

• resposit@na.infn.it
• rosario.esposito@na.infn.it

If I send a single message to both aliases I still receive 2 copies as you can see from the attached log.

Is the "duplicate" sieve extension supposed to work this way ?

Any help would be much appreciated !

-- Rosario Esposito