3.83M accounts from Trillian (trillian.im) 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 addressesIP addressesNamesPasswordsUsernames
In December 2015, the instant messaging application Trillian suffered a data breach. The breach became known in July 2016 and exposed various personal data attributes including names, email addresses and passwords stored as salted MD5 hashes.
Source: Have I Been Pwned (CC BY 4.0)