By default the Dynamic Screening service is applied to the following protocols: SMTP, POP, IMAP, WorldClient, ActiveSync, AutoDiscovery, the Management API, MDaemon Remote Administration. WebDAV and CalDAV, XMPP, and Minger. Use the options on the Protocols tab to determine which protocols will have their inbound sessions checked against the Dynamic Whitelist and Dynamic Blacklist, and which will have their authentication failures tracked. By default all options on this dialog are enabled.

See:

Auth Failure Tracking

Dynamic Whitelist

Dynamic Blacklist