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. https://siliconangle.com/2019/03/07/798m-email-addresses-found-exposed-misconfigured-mongodb-database/
blog article
798M EMAIL ADDRESSES FOUND EXPOSED ON MISCONFIGURED MONGODB DATABASE
The discovery was made by Bob Diachenko and Vinny Troia Feb. 25 on a misconfigured MongoDB database but only made public today. The database in question belongs to a company called Verifications.io that provides services to businesses who wish to vet email mailing lists for valid emails. READ MORE