Verify my mails (bulk mailing) - 15 million email list

This project received 16 bids from talented freelancers with an average bid price of $806 USD.

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I have about 15 million emails that I am looking for someone to verify for me. This list is very dirty, and only about 20% - 30% may be good emails. Basically, I want to see if the emails are good and can be delivered to the Inbox. My list is not an opt-in list. Syntactically the emails have been checked by me!
Tell me how you would:
1) Verify my list - give me details please
2) How long it would take for you to complete this task?
3) Tell me if you have done something similar in the past
4) What is the largest list you have verified in the past?
Please reply with the 4 answers, rather than your generic reply to a project on freelancer.

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