---
search:
  tags:
    - Threads
    - POST
seo:
  description: >-
    Replies within a thread. The sender, recipients, subject, and the… Reference
    for the POST /threads/{thread_id}/reply endpoint in the AI Inbx API API.
sidebar:
  label: Reply in a thread
  badge: POST
title: Reply in a thread
type: openapi-operation
---
Replies within a thread. The sender, recipients, subject, and the `In-Reply-To` and `References` headers are inferred from the conversation, so only the content is required — set `reply_all` or the individual fields to override what is inferred. Suppression, pacing, and idempotency behave exactly as on a send.

<Operation source="api-endpoints" id="reply-to-thread" />