Rate Limits & Quotas

To ensure fair usage and platform stability, SendClean implements rate limits on API requests and email sending volumes. These limits vary based on your account plan and configuration.

API Request Rate Limits

Rate limits are applied per SMTP user and measure the number of API requests you can make within specific time windows:

Per-minute limit: Maximum number of API calls allowed per minute (default: 60 requests/minute)

Hourly limit: Maximum number of API calls allowed per hour (default: 3,600 requests/hour)

Daily limit: Maximum number of API calls allowed per day (default: 50,000 requests/day)

Email Sending Limits

In addition to API rate limits, email sending is governed by volume quotas configured for each SMTP user:

Hourly email limit: Maximum emails that can be sent per hour (configured per SMTP user)

Daily email limit: Maximum emails that can be sent per day (configured per SMTP user)

Total limit: Total credit limit available for the SMTP user

When you exceed rate limits, the API will return HTTP 429 status code. Your application should implement exponential backoff and retry logic to handle these gracefully.