Yeah I agree in the real world most people assume emails are case-insensitive.

Moodle don't seem to be in any hurry to resolve this but I'll file an enhancement request for Totara and we'll see if we can figure out the best way to implement this.

May be a problem with existing data as the email address is supposed to be unique but as it is currently case sensitive Joe.Bloggs@org.com and joe.bloggs@org.com would currently be seen as two distinct addresses - so we might also need a tool for cleaning up existing data.