Misunderstandings with email

Question

Email

Hey! I describe the problem.

Once upon a time there was a box on Rambler, which I indicated at various registrations, etc. Then I switched to Yandex mail and set up the collection of mail from the previous mailbox (or forwarding, I don’t remember exactly). Transferred registrations to a new box, and deleted the old box on the Rambler website. BUT! Letters received by Rambler's mail still end up in a box on Yandex. How can this be?

Answer 1

As they say, no one deletes anything from themselves, the rambler said that they deleted it, but in fact they didn’t delete it.

Answer 2

forward true
deleted true
forward true

Answer 3

And you can go to the old box in rambler?

Answer 4

As far as I remember, for all sane postal services, the address previously used by someone is no longer allowed for registration, to protect users, either for some long period, or forever