Another forum thread included this response from Cloudlinux:
"As of the current version, we do not let users adding graylist entries manually (only removing is possible)."
Where do you get the IPs in the greylist? Herd immunity implies there is a master source of abuse IPs. I use a couple of the lists in csf.blocklists and do not want to duplicate.
Is there a place I can submit abuse IPs (something like abuseip.com) where they will get picked up by the Imunify360 greylist?