How should a user request a password reset when they do not remember the e-mail address that one of their accounts utilises?

[Moin]

@southpaw

unless the Admins have enabled the Hide email address taken site setting.

This reads as if the admins have changed the setting from its default. However, the setting is enabled by default: Hiding "e-mail taken" on sign-up by default. Therefore, unless admins explicitly disable it, it is enabled.