Plan limits

Each plan enforces resource quotas. When a limit is reached, the API returns a 403 with error type quota_exceeded.

Quotas by plan

Plan	Mailboxes	Sends / month	Team members
Free	0	0	1
Solo ($4/mo)	3	1,000	1
Pro ($9/mo)	10	10,000	5
Team ($29/mo)	50	100,000	Unlimited

Enforced endpoints

The following endpoints check quotas before processing the request.

Endpoint	Resource checked
POST /mailboxes	Mailboxes
POST /messages	Sends per month
POST /threads/{id}/reply	Sends per month

Error response

The error message includes current usage and the plan limit.

{
  "error": {
    "type": "quota_exceeded",
    "message": "Monthly send limit reached (1,000/1,000). Your Solo plan includes 1,000 sends per month.",
    "request_id": "req_abc123"
  }
}

Notifications

Organization owners receive email notifications when usage approaches a limit (80% for sends, 90% for mailboxes) and when a limit is reached (100%). These are sent at most once per billing period per threshold.

Free plan

Organizations without an active subscription are on the free plan. The free plan does not include mailboxes or sending. Subscribe to any paid plan to create mailboxes and send email. A 14-day free trial is available on first subscription. See Billing for details.

Trial limits

During the 14-day free trial, quotas are capped below full plan limits. Full limits apply after the trial ends or when the first payment succeeds.

Plan	Mailboxes	Sends / month	Team members
Solo trial	1	100	1
Pro trial	3	1,000	3
Team trial	5	5,000	5