Resend

Promptfree, for everyone, and the only version there is

Open the prompt in Claude CodeOpen the prompt in CodexOpen the prompt in Cursor

Copy

Do not rebuild a sending API. Build a wrapper so you are never locked to one provider.

STACK
- Node, SQLite via better-sqlite3, no framework

DRIVERS
- A send() interface, with drivers for at least two providers
- A development driver writing .eml files to disk instead of sending anything

TEMPLATES
- Markdown with front matter, rendered to table-based HTML and plain text
- Previewed at a local URL and snapshot-tested, so a template change cannot silently break the layout

THE OUTBOX, WHICH IS THE IMPORTANT PART
- Written inside the same transaction as the business change that triggers the email
- A worker sends from it afterwards
- A failed send must never roll back the order it belonged to, and a rolled-back order must never send a receipt

FAILURE
- Retries with exponential backoff, a dead-letter state, and a replay command

WEBHOOKS
- One receiver per provider, mapping their event names into a single internal vocabulary
- Rows appended, never updated

SUPPRESSION
- One list, consulted by every send regardless of driver

Include a runbook for the day a provider suspends your account — that day is the reason the driver interface exists.