Self-introspect the calling mailbox
Returns the mailbox the bearer token is scoped to, including live storage usage. Intended for SDK auto-discovery — call once on startup to resolve the mailbox ID. Requires a mailbox-scoped API key; root keys receive 403.
Responses carry a weak ETag header — send it back as If-None-Match on the next request and the server will return 304 Not Modified (no body) when the mailbox state has not changed.
Authorizations
Sendmux API key. Use a root API key for Management API routes, or a mailbox credential for Mailbox API routes. Obtain keys from the dashboard under API Keys.
Headers
Weak ETag from a previous response. Returns 304 when unchanged.
Query Parameters
Mailbox public ID to target when the credential grants access to more than one mailbox. Omit when the credential is scoped to exactly one mailbox.