How can you use APF to ban a IP address or domain?
You can use “apf -d ip.address” command to block bruteforcing ip addresses in APF permanently. I would also recommend looking at the following anti-bruteforcing solution called BFD that integrates into APF and will be blocking malicious IPs on itself:
http://rfxnetworks.com/bfd.php
As for the address of complains, it is usually the abuse address that is taken from the whois query on the IP behaving maliciously.
Finally, basic APF information is contained in the README file that comes in APF archive. It is also available online as http://rfxnetworks.com/appdocs/README.apf
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