It still requires you to maintain the entire server infrastructure. Sure if you already have your server up and running either way then spinning up another docker container or whatever else you use is pretty fast to do. But building and, more importantly, properly securing a server stack just for mail is a lot of work for little benefit. And if it stops working for whatever reason you won’t even notice it since Emails just get send into the void and are forever lost there.
If you really want to go the extra mile to be more independent from big services, then buying a domain and using that with something like tuta is enough. You can still jump ship whenever you like without the workload of server maintenance.
It still requires you to maintain the entire server infrastructure. Sure if you already have your server up and running either way then spinning up another docker container or whatever else you use is pretty fast to do. But building and, more importantly, properly securing a server stack just for mail is a lot of work for little benefit. And if it stops working for whatever reason you won’t even notice it since Emails just get send into the void and are forever lost there.
If you really want to go the extra mile to be more independent from big services, then buying a domain and using that with something like tuta is enough. You can still jump ship whenever you like without the workload of server maintenance.