How to use email for workitem updates

Hello
I've just taken over the role of RTC administrator from another employee.
I've been asked to implement a way of updating work items through the use of email.
The users have even suggested they should be able to create work items that way also.
Having done some searching I can only really find something called JazzConnect-EMAIL from CM-Logic.
Before I pursue that further has anyone here done it before?
Have you used the tool from CM-Logic?
My users also want to sign off on approvals also which this tool claims to be able to do.
Appreciate any comments.
GP.