Password protecting just Versamail?

[Phøenix]

Say I loose my Treo or someone pickes my Treo up from my charger and decides to snoop through my e-mails on Versamail, is there a way to password protect being able to launch only Versamail so they can't read/send any e-mails from my account?

I don't want to lock/password the entire phone/PDA unit, just access to that one particular application.

How can I do this? :confused:

I have a Verizon unit btw in case that helps or makes any difference.