I question that claim that Cisco, Google and others trust them a whole company.
I wouldn't be surprised if it was just a single purchase for a single license for personal use or just for a sake of completeness of during evaluation process.
I can claim my website is "used by Google" if I see just 1 hit from Google's IP.
We don't know and they don't say specifics of how it's used at Cisco or Google. Maybe they back up their spam folders and don't care about privacy or integrity of that data.
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