363K accounts from dBforums (dbforums.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, a data breach of the now defunct database forum "dBforums" appeared for sale alongside several others hacked from the parent company, Penton. The breach of the vBulletin based forum contained 363k unique email addresses alongside usernames, IP addresses, dates of birth and salted MD5 password hashes.
Source: Have I Been Pwned (CC BY 4.0)