DNS安全相關

<a href="http://www.unbound.net/">http://www.unbound.net/</a>

Unbound is a validating, recursive, and caching DNS resolver.

Unbound is designed as a set of modular components, so that also DNSSEC (secure DNS) validation and stub-resolvers (that do not run as a server, but are linked into an application) are easily possible.

<a href="http://josefsson.org/walker/">http://josefsson.org/walker/</a>

加密mail和pops

<a href="http://www.dovecot.org/">http://www.dovecot.org/</a>

<a href="http://blog.taragana.com/index.php/archive/dovecot-how-to-enable-secure-ssl-imap-pop3-with-free-self-signed-certificate/zh/">http://blog.taragana.com/index.php/archive/dovecot-how-to-enable-secure-ssl-imap-pop3-with-free-self-signed-certificate/zh/</a>

dovecot ：如何使安全（ SSL ）的IMAP ＆的POP3與（免費） ，自簽名證書

<a href="http://www.opendnssec.org/">http://www.opendnssec.org/</a>