Apps that need to send emails or receive emails.

Love the lifetime deal. 10GB across any number of accounts. That’s what I’ve got.

I only use it for automations (both send and receive); I’m on Proton for regular mail. They’ve got a few different web interfaces, so I think you can get spouse approval. Not sure on local storage (outside of POP/IMAP).

I can highly recommend MXroute. Just works. Great for integrations.