history of e mails?

I am involved in a court/adjudication case. In order to present my case I require a record of all e mails sent or received in the past 7 years. I am afraid I deleted e mails, can yahoo re-instate said e mails. To make the list shorter I can specifi certain senders and recipitants. This should bring down the list from 10,000 top 1,000 .......is it possible and what would be the cost

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