32.3K accounts from Hacking Team (hackingteam.com) were exposed in this breach. Besides email addresses, it included email messages.
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Email addressesEmail messages
In July 2015, the Italian security firm Hacking Team suffered a major data breach that resulted in over 400GB of their data being posted online via a torrent. The data searchable on "Have I Been Pwned?" is from 189GB worth of PST mail folders in the dump. The contents of the PST files is searchable on Wikileaks.
Source: Have I Been Pwned (CC BY 4.0)