---
title: "Send Reply"
method: POST
path: "/v2/conversations/{conversation_id}/messages"
tags: ["conversations"]
---

# Send Reply

`POST /v2/conversations/{conversation_id}/messages`

## Request

- Base URL: `https://api.mentium.io` (the document declares no server; this is the origin it was published from)
- URL: `https://api.mentium.io/v2/conversations/{conversation_id}/messages`
- Auth: HTTP bearer

Send a reply in the conversation thread.

## Path parameters

- `conversation_id` string, required

## Headers

- `mentium-workspace-id` string, nullable

## Request body

- SendReplyRequest
  - `body` string, required
  - `signature_id` string, nullable
  - `to_recipients` object[], nullable
  - `cc_recipients` object[], nullable
  - `bcc_recipients` object[], nullable
  - `subject` string, nullable
  - `attachment_keys` string[], nullable
  - `draft_message_id` string, nullable
  - `integration_connection_id` string, nullable
  - `media_urls` string[], nullable
  - `twilio_content_sid` string, nullable
  - `twilio_content_variables` object, nullable
  - `teams_target_type` string, nullable
  - `teams_recipient` string, nullable
  - `teams_team_name` string, nullable
  - `teams_channel_name` string, nullable
  - `teams_mentions` object[], nullable
  - `include_thread_history` boolean, nullable: Email replies only: when true, append the conversation transcript to the reply body so newly added recipients get context. Defaults to no history.

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/mentium/apis/mentium-api.md) - [All operations](https://skmtc.dev/mentium/apis/mentium-api/llms.txt) - [OpenAPI document](https://skmtc.dev/mentium/apis/mentium-api/revisions/b4ed8e59432e?raw)