- d Allows receipt of general (and sometimes random) debug messages.
- f Allows receipt of flooding notices.
+ d Allows receipt of local DNSBL messages (requires the dnsbl module).
+ D Allows receipt of remote DNSBL messages (requires the dnsbl module).
+ f Allows receipt of local filter messages (requires the filter module).
+ F Allows receipt of remote filter messages (requires the filter module).