Support for the mail integration was officially dropped. We tried to install it and it works in general.
One issue we ran into is that the wiki page looses its header as soon as we create or edit a page.
The connections menu would appear below the page. Only a page refresh would bring the menu back to the top.
Our users found the mailintegration usefull as well as the users. So please support the mailintegration officially (it already exists, you bought them from IBM) and fix this bug in the editor.