I’m using Zoho. It’s pretty cheap and wasn’t hard to set up with my domain.

On the positive side, if your vaultwarden server dies, the cached vault on any/all of your devices can be logged into and export the vault.

Why would your Jellyfin traffic need to go over the Internet if it’s on your local network? You should be able to install the Jellyfin app on your smart TV/Roku/etc or use the web client from a computer, point it at the Jellyfin local IP address, and view it over your LAN.

I’m using them for email with my custom domain. I’m using an android phone, so I can’t comment on their iOS apps, but their email and admin apps both work well for me.