EDIT: didn't realize this was satire when I wrote this
Setting it up from scratch is extremely annoying but there are foss solutions which manages everything mentioned and more, you only need to install & add the specified DNS records. Modoboa does a great job at this: https://modoboa.org/en/
Also apparently there's no real way to migrate between email servers either
This seems false (unless I'm misunderstanding), you can just setup a second mailserver, change DNS records and run IMAPsync to get everything transfered (backend-indepently), the only thing that would need additional consideration is passwords.
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EDIT: didn't realize this was satire when I wrote this
Setting it up from scratch is extremely annoying but there are foss solutions which manages everything mentioned and more, you only need to install & add the specified DNS records. Modoboa does a great job at this: https://modoboa.org/en/
This seems false (unless I'm misunderstanding), you can just setup a second mailserver, change DNS records and run IMAPsync to get everything transfered (backend-indepently), the only thing that would need additional consideration is passwords.