Is there a way to use a password to access the mail application on my recently jailbroken iPod Touch?

jailbroken ipod I would stay clear of using passwords chances are it is no longer secure

This has become a huge problem for jailbroken iPhones and iPod Touches. They are completely unsecured right now. I would revert back to the stock firmware ASAP.

There’s a review here about an app called Lockdown.

http://www.iphonehacks.com/2009/01/jailbreak-app-lockdown-allows-you-to-password-protect-your-iphone-apps.html

And about the jailbroken app, make sure you turn off wifi when you’re not using, make sure you have it set to ask you when it joins a new network, and I can’t stress this enough, make sure you change your SSH password if you haven’t already (both for root and for mobile). That’s it.