What's the best solution for encrypting emails sent from within Gmail. This could be a browser extension, a GreaseMonkey script, or something else.
I realize that whoever is receiving the email will need some software configured to be able to actually read it.
Best Answer
Here is a Greasemonkey script for example: http://www.langenhoven.com/code/emailencrypt/gmailencrypt.php
Also try to google for Gmail + PGP!
Hope this helps.