hydroxide

A third-party, open-source ProtonMail bridge. For power users only, designed to run on a server.

hydroxide supports CardDAV and SMTP.

Usage

Your credentials will be stored on disk encrypted with a 32-byte random password. When configuring your client, you'll need this password.

go get github.com/emersion/hydroxide
hydroxide auth <username>

You must setup an HTTPS reverse proxy to forward requests to hydroxide.

hydroxide carddav

Tested on GNOME (Evolution) and Android (DAVDroid).

For now, it only supports unencrypted local connections.

hydroxide smtp

MIT