2.61M accounts from GSM Hosting (gsmhosting.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In August 2016, breached data from the vBulletin forum for GSM-Hosting appeared for sale alongside dozens of other hacked services. The breach impacted 2.6M users of the service and included email and IP addresses, usernames and salted MD5 password hashes.
Source: Have I Been Pwned (CC BY 4.0)