327K accounts from Mac Forums (mac-forums.com) 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 addressesPasswordsUsernames
In July 2016, the self-proclaimed "Ultimate Source For Your Mac" website Mac Forums suffered a data breach. The vBulletin-based system exposed over 326k usernames, email and IP addresses, dates of birth and passwords stored as salted MD5 hashes. The data was later discovered being traded on a popular hacking forum. Mac Forums did not respond when contacted about the incident via their contact us form.
Source: Have I Been Pwned (CC BY 4.0)