🤔 this does seem like a complex feature to implement. Relay.tools goal is to make management of the relays as easy as possible with no cloud provider lock-in. Managing one off domains and SSL certificates would add to the complexity of the software in a way that does not align with the goal.

If you were to host relay tools yourself using the opensource code you could manage the domain and certificate for all your relays at a custom domain. You can also run spamblaster on your own relay and manage it with relay.tools.

If you are unhappy with the relay.tools service at any time I can refund you the sats. Thanks for trying it out. 🌱