Nylas has somewhat of a weird model. The Nylas client doesn't connect to you mail provider directly, instead the Nylas client connects to the Nylas Sync Engine

Nylas has somewhat of a weird model. The Nylas client doesn't connect to you mail provider directly, instead the Nylas client connects to the Nylas Sync Engine. It used to be that using this API for this was a couple hundred a year, per account. Both the client and the sync engine are open source, so you've always been able to host your own. https://github.com/nylas/sync-engine https://github.com/nylas/sync-engine