As far as I see, the problem is that Myself@example.org 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?