Did you have to reboot the server in order for this change to take effect? Changed the max size to 0 about an hour ago, and still seeing “blocked using spamhaus.org” show up in the logs every few mins. Example:
Dec 4 10:06:21 box postfix/smtpd[26159]: NOQUEUE: reject: RCPT from o4.pro.revue.email[168.245.104.220]: 554 5.7.1 Service unavailable; Client host [168.245.104.220] **blocked using zen.spamhaus.org** ; https://www.spamhaus.org/sbl/query/SBL423186; from=<bounces+7458214-3916-redacted=stoop.email@pro.revue.email> to=<redacted@stoop.email> proto=ESMTP helo=<o4.pro.revue.email>