44.3M accounts from Data & Leads (datanleads.com) were exposed in this breach. Besides email addresses, it included employers, iP addresses and job titles.
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Email addressesEmployersIP addressesJob titlesNamesPhone numbersPhysical addresses
In November 2018, security researcher Bob Diachenko identified an unprotected database believed to be hosted by a data aggregator. Upon further investigation, the data was linked to marketing company Data & Leads. The exposed Elasticsearch instance contained over 44M unique email addresses along with names, IP and physical addresses, phone numbers and employment information. No response was received from Data & Leads when contacted by Bob and their site subsequently went offline.
Source: Have I Been Pwned (CC BY 4.0)