List unsent drafts on an inbox

Returns the unsent drafts on the given email inbox. The inbox is identified by its channelId — the same value returned as channelId from GET /api/users/{userId}/inboxes.

Each item in the response is a draft entry with the parent discussion's streamId attached. Drafts currently in the process of sending (after POST /api/email/send was called and before the upstream provider accepts the message) are excluded.

With API-key auth the only scope check is that the inbox belongs to your company. With delegate-token auth (inboxes:* scope) the inbox must also be one the authenticated user can reach personally or via a team membership.