I have followed following how to here:
Connecting with SQLGrey - Zimbra :: Wiki
When we edi t Edit /opt/zimbra/conf/postfix_recipient_restrictions.cf
in order to add %%contains VAR:zimbraMtaRestriction check_policy_service inet:127.0.0.1:2501%%
i have to erase default one line %%contains VAR:zimbraMtaRestriction check_policy_service unixrivate/policy%% ???
Also expect sqlgrey i use dspam, dcc razor and python.
Thank you for your help