Your title says Sky email but your post says Yahoo email so
For Sky email accounts it should be deleted if not used for 6 months as per this:
https://www.sky.com/help/articles/inactive-sky-yahoo-mail-accounts
For Yahoo email accounts it is this you need to read:
https://help.yahoo.com/kb/close-reactivate-yahoo-account-sln2044.html?guccounter=1
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