Inactive or old Yahoo email accounts.

Yahoo is planning to give away inactive accounts. So if you have one perhaps grab it back or someone else may be able to use your handle

http://nakedsecurity.sophos.com/2013/06/18/yahoos-going-to-boot-us-off-our-deadbeat-accounts-but-who-is-going-to-grab-them/

Don't they give the old users a warning first that their account is about to be given away ?

Don't they give the old users a warning first that their account is about to be given away ?

Of course! Right to the inactive account ;)

Yahoo is now going to have a ''not my email'' button for users who are getting emails for owners of recycled usernames.

http://techcrunch.com/2013/09/24/yahoo-will-offer-not-my-email-button-to-report-mistaken-deliveries-due-to-username-recycling/