Reference
Rate limits
Limits protect the platform and your reputation. Higher limits are available on request.
Reading the headers
Each response reports your remaining quota. Back off with exponential delay when you receive a 429.
X-RateLimit-Limit: [N] X-RateLimit-Remaining: [N] Retry-After: [seconds]
LimitValue
Requests per second[Per plan]
Recipients per message[Per plan]
Message size[Max size]
Daily sending[Per plan and warmup state]
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