A few weeks ago, we deliberately unsubscribed 250,000 people from HubSpot's Marketing Blog -- people who had opted in to receive emails about new content we published on the blog but hadn't engaged with those emails in 6 months. This subscriber purge brought our total subscriber count from 550,000 down to 300,000. Why do this when growth is what we all aspire to? What gives? Graymail. Graymail is what gives.
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