In our case, we wanted to borrow the UX of email (to be intuitive to knowledge workers) but not necessarily the implementation.

Full control of your data was a design principle from the beginning, including being able to run fully offline with local models, so we didn’t want to add a dependency on email.

With that said, you can certainly hook up an MCP server and have the agents read and send emails (with human-in-the-loop approval) on your behalf.