It happens the same with the rest of information of the e-mail.
Greetings
Email notifications now with 2.1, in our latest code commit (please keep in mind that 2.1 release is not final and we made constant changes in the code repository) force email notifications only on workunits and NEW/CLOSE events. Contents on mails uses a mail template file, you can edit in the setup option. They uses a macros to replace contents of text, if you have modified the default macros, probably you have ommitted or deleted something, take a look. We're using it on daily basic (for our customer support) and it works fine.