Anti Spam policies not allowing certain CIDR addresses

Copper Contributor - policies and rules - threat policies - anti-spam policies - connection filter policy


I am adding addresses to the allow list but it will not allow me to add /20 or /18, etc. For a particular one that Mailchimp requests, I can only add it as 32 and not /20 which is what Mailchimp documented. /24 doesn't work either. Please see the screenshots below:

















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