cPanel Dictionary Attack option

In CURRENT and EDGE releases of cPanel (v18335) cPanel have added their own Dictionary Attack ACL to exim. We would encourage users to use this new feature in preference to our long standing Dictionary Attack ACL.The cPanel version takes advantage of the new exim ratelimit feature and means that exim does not have to resort to running a perl script and storing IP addresses in a file. This ought to have less performance impact on exim.The cPanel ACL will block SMTP connection attempts after 5 consecutive failures rather than the 4 that we configured in ours. It maintains the block for one hour. cPanel also have a whitelist for IP’s.