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The response headers describe your current rate limit following every request in conformance with the sixth IETF standard draft:

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Default Rate Limits

The default maximum rate limit is 100 requests per second per account, shared across authenticated E2 API endpoints. This single budget covers:
  • Email sending endpoints: 100 requests per second
  • Email management endpoints: 100 requests per second
  • Domain/configuration endpoints: 100 requests per second
  • All other authenticated E2 endpoints: 100 requests per second
This number can be increased for trusted senders upon request.

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Rate Limit Response

After exceeding the rate limit, you’ll receive a 429 Too Many Requests response error code:

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Increasing Rate Limits

If you have specific requirements that exceed the default limits, you can request a rate increase:
1

Contact Support

Reach out to our support team at support@inbound.new with your requirements.
2

Provide Use Case Details

Include details about your use case, expected volume, and business requirements.
3

Review and Approval

Our team will review your request and work with you to find an appropriate solution.

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Rate Limit by Endpoint

Rate limits are applied per account. If you’re using multiple accounts, each account has its own rate limit bucket.
Important: The SDK will return rate limit errors directly - you must handle them in your application code.

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Next Steps

Authentication

Learn how to authenticate your API requests

Send Your First Email

Start sending emails with proper rate limiting

Error Codes

See all API error codes including rate limit responses