Limits & Quotas
Plan limits, rate limits, and quotas for Robotomail accounts.
Plan comparison
- Free plan: 1 mailbox, 50 sends/day, 1 GB storage, platform subdomain only
- Paid plan: Unlimited mailboxes, 2,000 sends/day per mailbox, custom domains, $5/mailbox/month (3 mailbox minimum)
Send limits
Each mailbox has an independent daily send counter that resets at midnight UTC. When the limit is reached, send requests return 429 Too Many Requests.
The current send count is available on the mailbox object (dailySendCount) and via GET /v1/account (sentToday aggregate).
Storage limits
Free accounts have 1 GB of attachment storage. Paid accounts have higher limits. Storage usage is tracked per-account and visible via GET /v1/account (storageUsedBytes and storageLimitBytes). Uploading an attachment that would exceed the limit returns 413 Payload Too Large.
Rate limits
- Signup: 5 requests per hour per IP
- Send: Subject to daily send limits per mailbox plus SES rate limits
- General API: Standard rate limiting applies — check
X-RateLimit-Remainingheaders
Message size limits
- Per attachment: 25 MB maximum file size
- Total message: 10 MB (SES raw message limit)
- Subject: 998 characters maximum