POST

Try POST /inboxes/{inbox_id}/threads/{thread_id}/labels — Resend API

Resend playground

Add labels to an inbox thread

Credentials

Resend API key · sent as Authorization

Kept in this tab only. Requests go through apicheats.dev's same-origin proxy straight to api.resend.com; the proxy stores and logs nothing about them.

Headers

User-Agent · fixed

Path

inbox_id · required · string The Inbox ID or the inbox email address, such as `[email protected]`. A value that contains `@` must be a valid email address, and any other value must be a UUID, or the request returns a 422. The address match is case-insensitive and never falls back to the inbox `name`. An address that matches no inbox returns a 404. thread_id · required · string The Thread ID.

Body application/json

1 body fields

labels · required · string[] — The IDs of the labels to apply to the thread. Between 1 and 10 IDs, each a label of the inbox.