Selfhost Protonmail SMTP

What kind of settings should i use for ? Is it possible to send mails to protonmail over smtp ?

Nope. They don’t allow direct 3rd party client connections to the service. You have to use their “Bridge” product that runs as a kind of mini mail server on your computer that you then connect you email client (or in this case, your Bitwarden server) to. The Bridge then relays your mail back and forth to the PM servers. The bummer here is that you have to be a paying subscriber to PM. I subscribe cuz I use their Plus VPN service too, but I wish they’d open up Bridge to everyone. Oh well, maybe someday.