Have to admit that there is a chance that I have changed the email account in BTT account some years ago (after there was some warnings or something).
In the case you have changed the email address associated with your bitcointalk account,
you should see an email sent to your old email address regarding the email address change.
Currently no trace of such an email. If that happened 2 - 5 years ago, I likely deleted it, coz in those days "everything was fine".