Quotas, rate limits, and production access

OpenSend has application-level rate limits, plan quotas, and provider-side sending limits. Treat them as separate controls.

Raw markdown

Middleware rate limits

When rate limiting is enabled with Redis, OpenSend applies stricter limits to high-risk routes:

Single email sends: 20 POST requests per minute.
Batch email sends: 5 POST requests per minute.
API key mutations: 10 write requests per minute.
Domain creation: 10 POST requests per minute.
Other write operations: 30 requests per minute.
GET requests: 100 requests per minute.

If RATE_LIMIT_BACKEND is disabled, these middleware limits are not enforced. If it is set to redis, REDIS_URL must be configured.

Plan quotas

Hosted plan quotas are counted across API and broadcast sends. Current public plan examples include Free at 5,000 emails/month, Starter tiers at 55,000 or 100,000 emails/month, Growth tiers up to 500,000 emails/month, and Scale/custom for BYO AWS or custom needs. Use the billing dashboard as the source of truth for the active workspace.

Provider limits

Self-hosted deployments also depend on AWS SES account status, region, production access, daily quota, and per-second send rate. If OpenSend accepts mail but SES rejects delivery, inspect provider errors and account quota.