Someone hacked my yahoo mail account in 2015 and changed everything. I couldn't access it since and the e-mail account is the one I used for very important contacts. Please how do I recover the account from the hacker?
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Hello, I'm sorry to hear that. Hopefully I can help you. Have a look in this article produced by CCM giving you all of the possible solutions on how to recover a potentially hacked yahoo account.
Unfortunately, the article is exhaustive, containing all the known solutions.
A final option would be to contact yahoo support directly.