Securing your email in OS X

Doug Bowman has a fantastic article describing how to secure your email over wireless connections via SSH tunnels in Secure wireless email on Mac OS X:

I’m always amazed when I see friends naively checking email without using some type of secure connection. They open up their laptop in a public setting, select any available wireless network, and immediately pop open their email client to start sucking down their messages.
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So how do you secure your email and keep it private from curious eyes? What does it mean to read my email “securely”?
As mentioned above, there are many means of safeguarding email communication. They each have varying degrees of security and capability. Methods range from access to a trusted VPN, to certain secure web-based email applications (webmail), to allowing connections over SSL, sometimes known as POPS or IMAPS. If any of these options are available to you, you may want to investigate them further before taking any of the steps below.

Well worth the read.