Protonmail
https://protonmailrmez3lotccipshtkleegetolb73fuirgj7r4o4vfu7ozyd.onion/

Access all Proton services with the Tor anonymity network ,Proton has an official onion website for Tor users.One-click access to the Tor network

With Proton VPN, you don’t necessarily need a Tor browser to access hidden services. Use your regular browser to connect to the Tor network using your Proton VPN Plus account.

Proton VPN Tor servers :

Our server network includes nodes that reroute your internet traffic through the Tor network. Proton VPN has Tor servers in several countries. The servers that connect to the Tor network include “TOR” in their label.
Access hidden services

Connecting to one of our Tor servers enables you to access hidden services and onion sites. For example, you can connect to Proton’s onion site at https://protonmailrmez3lotccipshtkleegetolb73fuirgj7r4o4vfu7ozyd.onion(new window) for extra privacy.

Tor for every device :

You can use your Proton VPN app to connect to the Tor network on virtually any device without needing to download any other apps. Simply connect to one of our Tor servers with a single tap.