In Abstractlogic, it is now possible to use an email address instead of an identification number as a user ID. You can find this setting under menu item 1. Parameters → 1.02 Abstract Settings → Acknowledgement tab.
By default, this option is turned off. If you toggle the switch to ‘Yes’ as shown above, the registrant’s email address will be displayed as their user ID on the final page of registration, as well as in the confirmation email they receive.