HOW TO: Secure Your EMail and IM Communications
Wired and wireless networks can be easily snooped. What does that mean to you? Anyone with a computer on your network—or in your area, if you use wireless access—can monitor your communications, unless you make sure those communications are secured.
You can easily and simply upgrade your e-mail to be secure and private. A free - e-mail security certificate will certify that all of your outgoing messages really came from you and have not been altered. And if your correspondents use certificates as well, then exchanging keys with them will securely encrypt any e-mail between you, protecting it from snooping eyes. Secure Your E-Mail and IM Communications - Reviews by PC Magazine