I want to know if there any more ways to encrypt data from my computer. So far I have setup Hamachi for a VPN between my laptop and pc. I have also setup WPA encryption on my wireless router, I also enabled MAC address filtering. I want to know what I can use to encrypt my email messages. I currently use the Thunderbird email client. I'm sure there is something free and that is what I am looking for. I have found a few services but they are not completly free, they only have trials.