398K accounts from Lolzteam (lolzteam.net) were exposed in this breach. Besides email addresses, it included usernames.
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Email addressesUsernames
In May 2018, the Russian hacking forum Lolzteam suffered a data breach that exposed 400k members. The impacted data included usernames and email addresses which were later redistributed via another hacking forum.
Source: Have I Been Pwned (CC BY 4.0)