How do I stop receiving Greenify forum/social emails?

My email inbox is full of numerous emails from some type of forum or social communication network for Greenify (app installed on my Android 5.1.1 phone). I don't recall, but I must have accidentally signed up to receive these, but I no longer want them cluttering my Gmail inbox. I couldn't find a setting on my phone app, so I'm wondering if there's an on-line option where I can disable/cancel this.

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