This is an old revision of the document!
See also PowerDNS
See also SSMTP
See also ConfigServer Security & Firewall (CSF)
http://www.thatfleminggent.com/2009/08/09/getting-a-powerdns-recursor-up-and-going-fast
http://windowsitpro.com/networking/secure-your-dns-servers
https://kb.isc.org/article/AA-00874/0/Best-Practices-for-those-running-Recursive-Servers.html
http://www.microsoftnow.com/2013/10/hosting-your-public-dns-servers-on-windows-azure.html
apt-get install pdns-recursor
vim /etc/powerdns/recursor.conf allow-from=0.0.0.0/0