Slack buys Astro and shuts down its email app

Slack has purchased Astro, the maker of an email app with a built-in smart assistant that helped sort through your messages and elevate important items to your attention.
It may seem curious for Slack, the giant chat app with the goal of killing email, to buy an email app — but the pairing makes a good deal of sense. Astro’s focus was on business users, and it built out some smart integrations inside of Slack. With the two teams combined, Slack can use Astro’s experience to bu