# 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.