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Fluxomail enforces per‑minute limits per API key. Exceeding the limit returns 429 with Retry-After seconds. Behavior
  • Per‑key window: 60 seconds
  • Header: Retry-After: <seconds>
  • Counters reset automatically each minute
Response headers
HeaderTypeDescription
Retry-AfternumberSeconds to wait before retrying
Handling
  • Backoff and retry after the indicated time
  • Use Idempotency when retrying POSTs
Response headers
HeaderTypeDescription
X-RateLimit-LimitnumberRequests allowed per minute for this key
X-RateLimit-RemainingnumberRequests remaining in the current window
X-RateLimit-ResetnumberUTC epoch seconds when the window resets
Example response 
HTTP/1.1 429 Too Many Requests
Retry-After: 17
Content-Type: application/json; charset=utf-8

{ "error": "Rate limit exceeded" }