Agree with Steve. You can use PGP for free.
The GNU Privacy Guard - GnuPG.org
Have the people you email with use it also. It's not that hard. Or you can buy it here:
PGP Data Protection Products - Endpoint, Email, File and Server Data Protection
I have PGP on 3 of my computers. You can encrypt files and create PGP disks, or even get whole disk encryption. Do you carry a laptop? I would assume you have your computers password protected. But even then anyone with a bootable Linux disk can peruse your hard drive. Do you just delete files, or do you use an app to securely erase them from the hard drive? My point is there are a lot of other areas for concern over privacy with digital information besides just email. And I've barely mentioned security and privacy online.., websites tracking your IP address, cookies, Flash cookies. Did you know identity thieves can find info about you if you've created gift registries that are searchable online? It goes on and on and on...