Yup, the email body worked with the global reference. I thought it wasn't working when emails weren't being sent ...
... but when I put the email body file in the folder webassit/email/templates/ the email sending worked.
So, the email body file must be in webassit/email/templates/ ? Please confirm and/or clarify so that I can be sure on this. Thanks.
(I didn't see this in any help documentation and the Universal Server Behavior gave me the impression that I could select the email body file from anywhere.)