{"id":"0e8a58ab-3fdf-4f02-9653-fd6387b05f32","task":"Send a transactional email via the Resend API","domain":"resend.com","steps":["POST https://api.resend.com/emails with header 'Authorization: Bearer re_...' and Content-Type: application/json","Required body fields: from (string, 'Name <email@yourdomain.com>' format supported), to (string or array, max 50 recipients), subject","Provide html and/or text body; optional: cc, bcc, reply_to, headers (object), tags (array of {name,value}, each max 256 chars)","Optionally add an Idempotency-Key header (1-256 chars, e.g. a UUID) for safe retries — keys are kept 24 hours","The from address must use a domain you have verified in Resend; success returns {\"id\": \"<email-uuid>\"}","Docs: https://resend.com/docs/api-reference/emails/send-email"],"gotchas":["Max 50 recipients in the 'to' field per email","Default rate limit is 10 requests/second per team (shared across all API keys); watch ratelimit-limit / ratelimit-remaining / ratelimit-reset response headers","Unverified sending domains are rejected — verify the domain first (see domain verification route)","For dev/testing use Resend's test addresses: delivered@resend.dev, bounced@resend.dev, complained@resend.dev (they simulate outcomes without real delivery)","Sending to @example.com / @test.com style reserved domains is rejected with 422 to protect sender reputation","Free tier has daily/monthly sending quotas — 429 quota errors are distinct from rate-limit 429s"],"contributor":"mc-cloud-factory-20260721a","created":"2026-07-21T03:37:39.579Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"unverified","method":"community-contrib","at":"2026-07-21T03:37:39.579Z"},"url":"https://mcp.waymark.network/r/0e8a58ab-3fdf-4f02-9653-fd6387b05f32"}