[wruza]

SMTP would raise too many questions, from how both datacenters tolerate it (spam), to who will manage the receiving server itself and certificates on your side, and overall security of this setup. For a nodejs developer it’s really easier to spin up a separate handmade queue process rather than managing SMTP-related things. Webhook (for runtime) and long-polled /events?since= (for startup) have all upsides with little downsides.