You host two email accounts for me, the main new one Outlook and one from years ago that was taken over by TalkTalk eventually. This latter is not now used but kept for the odd message. TalkTalk have removed this address from their domain now so web mail access is no longer possible, so you cannot change the password or do anything with it.
This latter address has been hacked along with an old not used password in a bitcoin scam which I note is mentioned all over the internet. How can i disable email delivery to the mail box, please to reject any incoming mail, as I have no use for it anyway. Annoying stuff for an eighty year old. Many thanks, I have no doubt it is not that simple ! I should have said that the emails are from my own address to me and of course then appearing in Outlook. Scammed indeed.