[HumanCCF]

One of the biggest problems people have when self-hosting their own mail servers is delivery issues because the big email providers don't trust your server. The goal with the shared mail server is to create a server that is trusted by those providers and then making it accessible to users of the .self TLD so they can forward their mail to it and have confidence it will be delivered. It would act only as a relay, users would still self-host their own mailboxes. And nothing would force you to use it.