Node.js Welcome Flow Explained — Custom-Domain Email API Suppression, DKIM, Polling
Short answer: for a healthtech marketplace seller alert, choose an email API with custom-domain DKIM, a pre-send suppression check, and an event list that a scheduled job can poll. Keep the notification outside the order transaction. This design fits a standard US/EU SaaS workflow when delayed delivery status is acceptable; if delivery events must drive application state within seconds, choose a…
The Node.js welcome flow for a custom-domain email API involves choosing an API that offers custom-domain DKIM, a pre-send suppression check, and an event list that can be polled. This design is suitable for a healthtech marketplace seller alert, where delayed delivery status is acceptable. The decision is mainly about integration effort rather than the speed of delivery.
The article highlights that the team will still be responsible for several controls after launch, such as credentials, domain gates, retry identity, callback ingress, poll cursors, retention, and vendor-specific telemetry. The article also emphasizes the importance of separating order and notification state machines and adhering to four invariants to ensure proper handling of suppressed or opted-out addresses, production mail verification, retry mechanisms, and avoiding double processing of polled events.
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