Yes! This is exactly what makes Fleep unlike any other team messenger. You can add external individuals or even add multiple teams into one conversation!
You can add anyone to a team conversation with their Fleep ID or email address*.
Here, for example, the company's CEO Julie was added to one of the development team's conversation, so she could be aware of the team's release updates:
*If they are not a Fleep user yet, they will receive all messages as normal emails until they sign up.