Listen to Software Defined Talk: https://www.softwaredefinedtalk.com/346 (12mins in)

• https://techcrunch.com/2012/08/28/rackspace-acquires-y-combinator-startup-mailgun-an-api-that-abstracts-creating-email-inboxes-for-apps-and-web-sites/
• https://techcrunch.com/2021/09/30/sinch-acquires-pathwire-the-company-behind-mailgun-and-mailjet-for-1-9b-to-add-email-into-its-api-based-communications-platform/

Ev went on to start Teleport, which just announced their Series C: https://goteleport.com/blog/series-c/