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Returns every mailbox your organization owns. This is usually the first call an integration makes, because every other endpoint takes an address and this is where the valid ones come from.
Required permission: Mailboxes → Read (mailboxes:read)

Request

This endpoint takes no parameters. It returns every mailbox on the organization the key belongs to — there is no pagination, because an organization has tens of mailboxes, not thousands.

Response

array
Every mailbox the organization owns, sorted by address.
Both non-active and Private mailboxes are listed. Filtering them out would be worse than including them: an integration would report a mailbox as missing when it exists and is simply unreadable, or not ready yet. mode and status tell you which endpoints will accept it.

Aliases

Required permission: Mailboxes → Read (mailboxes:read) Addresses your organization owns that are not mailboxes in their own right. Mail to an alias is delivered into the mailbox behind it, and you can send as one.
owner is the mailbox the alias delivers into — and the one that files the Sent copy and carries the sending limits when you send as the alias. An integration reasoning about either has to know which mailbox is really behind the address.
Only aliases pointing at a usable Smart mailbox are listed. An alias whose target is Private or suspended is left out rather than listed and then refused everywhere — it is not a usable sending identity, and an address that exists in one endpoint and fails in every other is worse than one that is absent.Aliases are read-only here. Creating one reserves a name on a domain permanently and interacts with role addresses and catch-all, which is a considered decision rather than an API call — it stays in the dashboard.

Errors

A key with no permissions at all — possible only for keys created before permissions existed — authenticates and then fails here with forbidden. The key list in Settings → API keys marks those; revoke and recreate them. See Errors for the full response shape.