Usage and limits
Understand email events, storage, recipient and attachment limits, and workspace safety caps.
Included capacity
The launch plan includes one mailbox, 1 GB of storage, and 1,000 email events each month. Yearly billing is $12 per mailbox; monthly billing is $2 per mailbox. The product UI shows the current included capacity and billing state for the workspace.
A stackable $5 monthly capacity pack adds 5 GB storage, 5,000 monthly events, 50 inboxes, 5 domains, and 5 organization seats.
What counts as an event
- One accepted incoming mailbox delivery is one event.
- Each outbound recipient is one event.
- Each forwarded copy is one event.
- Rejected spam, quarantined mail, and duplicate provider events are not billed.
Message limits
| Limit | Current boundary |
|---|---|
| To recipients | 10 per message |
| CC recipients | 10 per message |
| BCC recipients | 10 per message |
| Subject | 240 characters |
| Plain or HTML body | 250,000 characters each |
| Attachments | 10 per message |
| Single attachment | 5 MB |
| Complete message | 10 MB configured boundary |
Sending caps
New workspaces use conservative daily sending limits. Monthly event limits and daily outbound limits are checked before a message is queued. A request that exceeds a cap returns 429 with a specific error code such as monthly_limit or daily_limit.
Rate limiting can also return 429 when too many send requests arrive in a short window. Use bounded backoff and do not create an uncontrolled retry loop.
Billing state
A workspace can be trialing, active, past due, or inactive. Expired trials and inactive subscriptions cannot send. Incoming mail remains available when outbound sending is paused for delivery reputation review.