Download Sollo.

Sollo is in preview. It runs on macOS and Linux. Download it, then create your account in the app.

macOS

Its keys go into the Keychain.

Needs a Secret Service keyring, such as gnome-keyring, which Proton Mail Bridge uses too.

An email address, for your Sollo account. You create it in the app.
For Mail with Proton: Proton Mail Bridge, running on the same computer.
Sorting on your computer, optional: a local model server such as Ollama or LM Studio.
Drafts and questions, optional: an Anthropic API key, set in Settings, AI.