Idempotency

Safely retry mutating requests without duplicating sends.

Pass an Idempotency-Key header on POST /v3/messages or POST /v3/messages.batch to safely retry without duplicating sends.

Keys are stored for 24 hours, scoped to the API key that made the request. If you replay a request with the same key, wemail returns the original response — even if your network failed mid-flight — and records a duplicate event on the original message so replays are visible in Activity. Use a fresh UUID per logical operation.

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Idempotency-Key: 8c6b1fae-0f4f-4f3b-9d1d-2a39e6c2c7bd