Unable to add RBLs from webinterface / CLI

[Eno]

Hi,

I'm trying to add RBLs from the interface but i'm getting this error:

I also tried from the CLI :

zmprov mcf +zimbraMtaRestriction "reject_rbl_client zen.spamhaus.org"

Then checked the saved settings:

zimbra@smtp:~/postfix/conf$ zmprov gacf | grep zimbraMtaRestriction
zimbraMtaRestriction: zen.spamhaus.org

Seems good so far but when I look for postfix conf after a restart nothing has been saved:

zimbra@smtp:~/postfix/conf$ grep 'smtpd_recipient_restrictions' main.cf
smtpd_recipient_restrictions = reject_non_fqdn_recipient, permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, reject_unlisted_recipient, reject_invalid_hostname, reject_non_fqdn_sender, permit

Looks like a bug from this version, I'm using :

Release 6.0.4_GA_2038.DEBIAN5_64 DEBIAN5_64 FOSS edition.

Is there any workaround without upgrading Zimbra or manullay change main.cf from Postfix?

Thanks!

Edit: After looking my old posts, I harconf some files, it explains why the CLI is not working :
Weirdest Zimbra Problem Ever (postfix main.cf file changes) still no clue about the webinterface.