Hushmail is about the most insecure platform for secure communications.They co-operate with law enforcement; in non-js sessions they can capture your passphrase and store it to later decrypt any of your emails; if you have js enabled they can send you a specific js file that captures your passphrase and sends it to them; js enabled sessions expose your real IP to Hushmail. They have admitted to doing all of the above and more in cooperation with law enforcement. They can read your emails any time they want, and so can interested law enforcement agencies.As far as IE goes, it is not the preferred platform for the security conscious, to say the very least.