======Links======
[[http://www.zytrax.com/books/dns/|DNS for Rocket Scientists]] \\
[[http://www.amset.info/netadmin/split-dns.asp|Split DNS Configuration]] \\
[[http://dns.measurement-factory.com/surveys/openresolvers.html|DNS Survey: Open Resolvers]] \\
[[http://www.lifewithdjbdns.org/|Life With djbdns]] \\

=====Checks=====
[[http://www.dnsgoodies.com/|DNSGoodies]] \\
[[http://dnscheck.iis.se/|DNSCheck]] \\
[[http://www.squish.net/dnscheck/|squish.net dns checker]] \\

=====(White)lists=====
[[http://www.dnswl.org/|DNSWL.org]] provides a Whitelist of known legitimate email servers to reduce the chances of false positives while spam filtering. We effectively divide the entire Internet up (by IP) into five categories, and provide you with efficient access methods to this data for free. \\

=====DNS Tunneling=====
[[http://code.kryo.se/iodine/|iodine]] \\