There is no confirmation email upon registration, so you can use whatever address you want. This should be fixed first I think.
I don't quite remember when I registered mine a few years ago,
but if this is true, yes I agree it should be fixed first by requiring email confirmation
and I propose these suggestions below, if not yet implemented,
- when changing email address, it should also require confirmation on old email address
- if the current address becomes unavailable, changing it requires manual intervention (checking) by mods or theymos
- for reason of lost access (hacked email), request manual email change by providing signed message with staked btc address