3.44M accounts from InterPals (interpals.net) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Dates of birthEmail addressesGeographic locationsNamesPasswordsUsernames
In late 2015, the online penpal site InterPals had their website hacked and 3.4 million accounts exposed. The compromised data included email addresses, geographical locations, birthdates and salted hashes of passwords.
Source: Have I Been Pwned (CC BY 4.0)