If you're looking to really lock down security in your email, some folks apparently suggest WWII tech is best.
QuoteUsed properly, it's meant to be unbreakable. Experts suggest this is because the cipher produces completely random cipher-text and some believe that even the best supercomputers cannot crack this WWII approach.
Read more: http://www.foxnews.com/tech/2012/10/10/world-war-ii-encryption-for-your-e-mail
Me? It's my belief that if you communicate electronically somebody can get to it if they want it. But it might be fun to goof around with this.