We are still actively working on the spam issue.
DNSCrypt
DNSCrypt acts as a local DNS resolver and uses elliptic-curve cryptography when passing messages to and from the DNS server. This is extremely useful for mitigating MITM attacks on DNS. Only a few servers are known to currently support DNSCrypt, however, adoption is growing.
Note: if you install DNSCrypt, be sure to change the server it's using to something other than OpenDNS, as OpenDNS is known to hijack and block certain domains by default. Also be sure to change your DNS server address to that of the local resolver (usually 127.0.0.2 or 127.0.0.1).