Sendmux sets team-level limits for resources that can grow quickly. You can request more capacity from the relevant page when usage reaches the request threshold.Documentation Index
Fetch the complete documentation index at: https://docs.sendmux.ai/llms.txt
Use this file to discover all available pages before exploring further.
Default limits
Each new team starts with these limits:| Resource | Default limit | Guide |
|---|---|---|
| Domains | 25 | Domains |
| Mailboxes | 50 | Mailboxes |
| Sending accounts | 200 | Sending accounts |
| Webhooks | 10 | Webhooks setup |
| Active API keys | 100 | API keys |
Active API keys include infrastructure keys, sending keys, and mailbox keys.
Request an increase
When a resource reaches 80% of its current limit, Sendmux shows Request increase near the usage text on that page. API clients can request more sending-account capacity withPOST /providers/limits/sending-accounts/request-increase. Submit the request once. The page then shows the pending request state.
You can have one pending request per team and resource. Sendmux emails the requester when the request is approved or denied. Approved increases apply immediately.
At the hard limit
When usage reaches the full limit, creation is blocked for that resource until the limit is raised or you delete an existing item. API create requests return409 limit_exceeded when the limit has been reached. This error is not retryable. Request an increase or reduce usage before trying again.
Email volume
Sendmux does not add a separate cap to incoming or outgoing email volume through this team-limit system. Sending through the managed Amazon SES account still follows its daily sending limit. Request a review from Accounts or withPOST /providers/shared-amazon-ses-limit-request. Your own providers may also enforce provider-side sending limits.
Related guides
Domains
Add and verify custom domains.
Sending accounts
Add providers and request managed account limit increases.
Webhooks
Subscribe to delivery and mailbox events.
API keys
Create, rotate, and revoke scoped keys.
API errors
Handle
limit_exceeded responses in API clients.