[Dovecot] dovecot + sieve

Hi,

In ower mail system we use postfix and dovecot v1.2.10 with sieve plugin and i think is work fine but.....

i need to have access to variables values like in these test script

 require ["enotify", "variables", "envelope"];
 keep;
 notify :importance "1" :message "TEST SIEVE ${from}: ${subject}"

"mailto:i_not_exist@hotmail.com";

but when i receive message, the values for "${from}" and "${subject}" are empty.

i don't know the reasons about these (i'm some lost with these issue)..

if help ... i put in master.cf (postfix) these value for dovecot delivery:

dovecot unix - n n - - pipe flags=DRhu user=mail:mail argv=/etc/dovecot/libexec/deliver -f ${sender} -d ${recipient}

¿is here the problem or what could be?

thanks in advance!

*Salu2 ;)*