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

[roke_julian_lockhart (Mr Beedell, Roke Julian Lockhart)]

@ice.d, that is worth a separate request. Unfortunately, what you propose was the original rationale for removing this feature by default, even though it was unfounded. What you propose would render that fear founded:

[Enhancement] Provide the reason that account authentication failed, rather than merely possible causes.