Thanks for the replies guys. Much appreciated.
Sigrid Wieshofer I tried your approach and, yes, I'm using the CRM IC E-Mail Editor.
I've assigned the user parameter for one of our test users and it seemed to have worked 
. But, my worry was that I assigned the parameter yesterday and it didn't work up until some time today.
So I noticed that you have to logout and login again for the changes to take effect
- Silly me.
Thanks again Sigrid Wieshofer
Regards,
Brian