71.2K accounts from Retina-X (retinax.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In February 2017, the mobile device monitoring software developer Retina-X was hacked and customer data downloaded before being wiped from their servers. The incident was covered in the Motherboard article titled Inside the 'Stalkerware' Surveillance Market, Where Ordinary People Tap Each Other's Phones. The service, used to monitor mobile devices, had 71k email addresses and MD5 hashes with no salt exposed. Retina-X disclosed the incident in a blog post on April 27, 2017.
Source: Have I Been Pwned (CC BY 4.0)