Greetings,
In order to deploy Mailcow to production, one of the things that we are keen to do is limit who can send externally to a specific set of users.
For example, user@example.com and volunteer@example.com cannot send externally. However, organizer@example.com is permitted to send externally.
If you know how this would work, please do let me know.
Thanks,
redstonedesigner