MN absolutely assured everyone, some time after Jeffery-gate, that old email addresses had been permanently deleted if users updated to a new address, as they put forward no business reason for retaining then.
I changed addresses then, and will be absolutely furious if
a) retained anywhere my old email address, and therefore
b) have reneged on their assurances that they were deleting all old eaddresses.
And b is the reason for the furious response. If that had happened it would clearly indicate untrustworthiness, and a bad attitude to their community (tell 'em one thing, do another - they're not worth straight dealing)