Guides
sending.ac exposes two APIs. They serve different jobs and use different keys.
Mailbox API
Section titled “Mailbox API”Send and read mail from mailboxes you already own, using an unmodified Microsoft Graph SDK. Point your existing Graph client at our base URL, authenticate with a sending.ac key, and the rest of your code is unchanged.
- Send and read mail — setup, sending, reading, paging, errors
- Reference — every operation
Provisioning API
Section titled “Provisioning API”Create users, senders, domains and mailboxes on behalf of your own customers. The platform handles Microsoft 365 tenant setup, DNS and mailbox creation.
- Provision mailboxes — the object model and the async path
- Reference — every operation
Still in internal testing; access is granted case by case.
- Authentication — the two key types, and why the wrong one
returns
403rather than401
The raw OpenAPI documents are served at
/specs/mailbox.json and
/specs/provisioning.json.