grep zimbraMtaRestrictionRBLs smtpd_recipient_restrictions.cf
The code does not lie. The documentation is clearly wrong, and the Admin console is clearly broken.
It's not been clear at all to the rest of us in this thread. Still isn't to me.:
zmprov ms `hostname` +zimbraMtaRestrictionRBLs zen.spamhaus.org
ERROR: account.INVALID_ATTR_NAME (invalid attr name: invalid attr name - unable to modify attributes: zimbraMtaRestrictionRBLs: attribute type undefined)
So can you file a bug with the details, including a "clear" explanation of the problem & solution to follow?