It mostly depends on if you want to have a web frontend or are happy to just login to thunderbird/sylpheed or other application. This still gets updated and wo

It mostly depends on if you want to have a web frontend or are happy to just login to thunderbird/sylpheed or other application. This still gets updated and works quite well: https://github.com/LukeSmithxyz/emailwiz https://github.com/LukeSmithxyz/emailwiz it installs dovecot/spamassassin etc for you, so i guess i'm more vouching for the RPi. I think a 5$ VPS would be worth it, you can probably run other stuff on it too like XMPP Only note to it i'd add is that depending on your domain name provider, you may have some issues with DKIM/SPF, but otherwise it should be fine.