Greylisting with ISPconfig 3 and Debian 8 doesn't work

Hello,

I suppose it's very simple. I've searched all Google. To work with ISPconfig you just have to install postgrey and add "check_policy_service inet:127.0.0.1:10023" in the "smtpd_recipient_restrictions" of postfix main.cf. On my server the checkbox option "greylist" in ISPconfig is inoperative. No matter the box is checked or not, if "check_policy_service inet:127.0.0.1:10023" is present in main.cf, all mailboxes are greylisted, and if not, all mailboxes are ungreylisted. I suppose there is a configuration between ISPconfig I have missed. Wich one ?

Thanks for help and happy new year.