• Airbnb
  • CODE
  • D-Link
  • Fliptop
  • Hi-media Groupe
  • Stitcher
  • Vodafone
  • Dow Jones
  • Lyft
  • NASA
  • Siemens
  • Netflix
  • Nokia
  • Pinterest
  • Slack
  • Yelp
  • Inuit
  • King County Government, WA
  • PBS
  • Stripe
  • The Seattle Times
  • The US Department of State
  • The CDC

The answer: They all use Amazon Web Services or Amazon SES which is what KegMetrics is using.

Sources:

https://aws.amazon.com/solutions/case-studies/all/

https://aws.amazon.com/ses/