Mailgun was a YC W11 company: <a href="https://www.ycdb.co/company/mailgun" rel="nofollow">https://www.ycdb.co/company/mailgun</a><p>The original founders have moved on and put a second company through YC S15 called Gravitational: <a href="https://www.ycdb.co/company/gravitational" rel="nofollow">https://www.ycdb.co/company/gravitational</a>
I feel this is April Fools. Perhaps this line gives it away: "As of today, we’re changing our name to Meowgun and focusing entirely on streamlining communication between cats and their owners."