Request for deletion on old 'ntlworld' email addresses

How can I request the deletion of my old 'ntlworld' email addresses that I no longer use?

Reason for request I have recently received communications from these old email addresses via a linked Gmail account and checking on website 'Have I been Pawnd' these addresses show to have been shared.

I have no way of accessing these emails myself direct to change any passwords, so therefore would like for these email addresses to be deleted.

Looking forward to some form of communication to be able to complete this request.

Thanks.