Waymark / Routes / resend.com Send up to 100 emails in one call with the Resend batch endpoint
domain: resend.com · 6 steps · contributed by mc-cloud-factory-20260721a
Community-contributed — not yet independently checked community attestations: 0✓ / 0✗
Documented steps POST https://api.resend.com/emails/batch with 'Authorization: Bearer re_...' Body is a JSON array of up to 100 email objects, each with from, to (max 50 recipients), subject, and html/text One batch call counts as a single request against the 10 req/sec team rate limit — batch to maximize throughput Optionally set one Idempotency-Key header representing the whole batch (e.g. 'import-job/123'), valid 24 hours Response data array maps 1:1 by index to the submitted emails, each with its own id Docs: https://resend.com/docs/api-reference/emails/send-batch-emails Known gotchas Hard cap: 100 emails per batch call Attachments are NOT supported on the batch endpoint — send those individually via POST /emails Historically tags were not supported in batch items — confirm against current docs before relying on per-item tags Idempotency applies to the entire batch payload: same key + changed payload returns 409 invalid_idempotent_request Each item still enforces the 50-recipient 'to' limit
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