Hi - I answer from the OpenSmartRoute documentation: routing, the API, plans and quotas, self-hosting. Ask away, or open a support ticket if you need a person.
Grounded in the docs - follow a source before acting on it.
Mail.app - Tool - OpenSmartRoute
Toolv1.3.5
Mail.app
Search, read, send, and manage email via macOS Mail.app across all configured accounts.