sovereign/roles/mailserver/templates/etc_postfix_pgsql-recipient...

user = {{ mail_db_username }}
password = {{ mail_db_password }}
hosts = 127.0.0.1
dbname = {{ mail_db_database }}
query = SELECT CASE WHEN sendonly = true THEN 'REJECT' ELSE 'OK' END AS access FROM virtual_users WHERE username = '%u' and domain = '%d';