397K accounts from Minehut (minehut.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswords
In May 2019, the Minecraft server website Minehut suffered a data breach. The company advised a database backup had been obtained after which they subsequently notified all impacted users. 397k email addresses from the incident were provided to HIBP. A data set with both email addresses and bcrypt password hashes was also later provided to HIBP.
Source: Have I Been Pwned (CC BY 4.0)