Mailgun

Mailgun offers APIs that allow users to send, receive and track emails. In practice that means replacing internal email with channels and direct messages.

It makes the most sense for every team. Alongside the main category they mention Email and Messaging. As a mid-sized product team themselves (201 to 500 people), they tend to serve customers of a similar scale best.

Mailgun is based in San Francisco, California and founded in 2010. Their site is mailgun.com.

Things worth asking about: search, retention policies, and external guest access. Ask for a trial on your own data, not a canned demo.

If you have worked with Mailgun, tell the next buyer what you paid and what surprised you. That is the part of this page we cannot write.