[Dovecot] copy LDA rule

Hi dovecot@.

I use the last dovecot (1.1.7) with sieve-plugin. All works perfectly. However, I would like to use a "copy" function. All mail sent by "toto@domain.tld" have to be copied in a folder (copy, and not move).

So, I don't want to use a fileinto rule.

I see in http://wiki.dovecot.org/LDA/Sieve there is a copy function (1.1 only).

A rule like:

if header :contains "From" "toto@domain.tld" { copy "test"; stop; }

does not work. I have nothing into my deliver or dovecot log. However, if I replace copy by fileinto, it works. But I want to copy the email, not move it. I don't find any examples in the Internet or the wiki.

Could you help me?

Thanks!

-- -Nicolas.