I can use smtpd_end_of_data_restrictions=check_policy_service unix:private/policy
just fine in the main.cf. However this has the drawback that i need to add -o smtpd_end_of_data_restrictions= to each filter in the master.cf which should not use the policy service again. When i try to only set the policy service once for the SMTP entry i.e. :smtp inet n - n - 10 smtpd -o content_filter=smgw:[127.0.0.1]:10025 -o smtpd_end_of_data_restrictions=check_policy_service unix:private/policy postfix complains about an invalid syntax (probably due the space between policy server and unix:private/policy) postfix/smtpd[808]: fatal: unexpected command-line argument: unix:private/policy Why can i reset the mtpd_end_of_data_restrictions in the master.cf - but not set them?