As far as I see, the problem is that is not identified with yourself, isn’t it? Yes it is, no doubts. I was only justifying myself about how I’ve missed the casing issue at first sight Maybe an advanced option like “normalize email addresses” could be added in account configuration? Maybe together with a warning like “use only if you have issues with users adding mixed-case email addresses” Is this acceptable or do you think it’s a “too geeky” workaround?