When a support team needs email for production errors, the constraint that changes the design is simple: error tracking and notification are different responsibilities. The error system should retain enough evidence to reconstruct the customer incident; a separate poller should decide when that evidence deserves an email. That boundary makes a vendor change reversible, and it prevents a bulk failure from turning into an inbox outage.

The practical answer is to let a notification service receive mail, poll the error API for new events, format an evidence-rich message, and suppress duplicates with a frequency window. In a Node.js application, Node can run the scheduler and mail client, but the contract should remain an ordinary adapter: fetch error groups and events, map them into an internal incident record, then call the chosen email provider.…