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Yahoo is an American l technology company.that it is email service provider company .yahoo mail is a famous mail service provider company .the yahoo users to use to for this service .that are many issues are create in our yahoo account,.If you have not recover your yahoo mail recovery , then you can simply use the multiple recovery options such as phone number and yahoo email recovery process . and another options that you call to yahoo customer service number usa.if you change yahoo mail password to your account then you follow off the rules. https://mail-customer-support.com/blog/yahoo-customer-service-number-usa