Reply to an inbox message

Sends from the inbox address through the standard email send pipeline. The recipient is the original Reply-To, falling back to From; original Cc recipients are not included. The subject is prefixed with Re: unless it already has that prefix.

Threading headers are derived from the original message: In-Reply-To is set to its RFC Message-ID, and References contains the original References values plus that Message-ID, de-duplicated and limited to the most recent 20 values.

POST

email_inboxes

{inbox_id}

messages

{message_id}

actions

JavaScript

import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
});

const response = await client.emailInboxes.messages.actions.reply('inbox_id', 'message_id', {
  text: 'text',
});

console.log(response.data);

import os
from telnyx import Telnyx

client = Telnyx(
    api_key=os.environ.get("TELNYX_API_KEY"),  # This is the default and can be omitted
)
response = client.email_inboxes.messages.actions.reply(
    inbox_id="inbox_id",
    message_id="message_id",
    text="text",
)
print(response.data)

package main

import (
	"context"
	"fmt"

	"github.com/team-telnyx/telnyx-go"
	"github.com/team-telnyx/telnyx-go/option"
)

func main() {
	client := telnyx.NewClient(
		option.WithAPIKey("My API Key"),
	)
	response, err := client.EmailInboxes.Messages.Actions.Reply(
		context.TODO(),
		"inbox_id",
		"message_id",
		telnyx.EmailInboxeMessageActionReplyParams{
			Text: telnyx.String("text"),
		},
	)
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", response.Data)
}

package com.telnyx.sdk.example;

import com.telnyx.sdk.client.TelnyxClient;
import com.telnyx.sdk.client.okhttp.TelnyxOkHttpClient;
import com.telnyx.sdk.models.emailInboxes.messages.actions.ActionReplyParams;

public final class Main {
    private Main() {}

    public static void main(String[] args) {
        TelnyxClient client = TelnyxOkHttpClient.fromEnv();

        ActionReplyParams params = ActionReplyParams.builder()
            .text("text")
            .build();
        var response = client.emailInboxes().messages().actions().reply("inbox_id", "message_id", params);
    }
}

require "telnyx"

telnyx = Telnyx::Client.new(api_key: "My API Key")

response = telnyx.email_inboxes.messages.actions.reply("inbox_id", "message_id", text: "text")

puts(response)

<?php

require_once dirname(__DIR__) . '/vendor/autoload.php';

use Telnyx\Client;
use Telnyx\Core\Exceptions\APIException;

$client = new Client(apiKey: getenv('TELNYX_API_KEY') ?: 'My API Key');

try {
  $response = $client->emailInboxes->messages->actions->reply(
    'inbox_id',
    'message_id',
    text: 'text',
  );

  var_dump($response);
} catch (APIException $e) {
  echo $e->getMessage();
}

telnyx email-inboxes:messages:actions reply \
  --api-key 'My API Key' \
  --inbox-id inbox_id \
  --message-id message_id \
  --text text

curl --request POST \
  --url https://api.telnyx.com/v2/email_inboxes/{inbox_id}/messages/{message_id}/actions/reply \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "text": "Thanks for the update."
}
'

{
  "data": {
    "record_type": "email_message",
    "id": "44444444-4444-4444-4444-444444444444",
    "status": "queued",
    "from": {
      "email": "agent@inbox.example.test"
    },
    "to": [
      {
        "email": "reply@example.com"
      }
    ],
    "cc": [],
    "bcc": [],
    "reply_to": null,
    "subject": "Re: Project update",
    "template_id": null,
    "template_variables": {},
    "attachments": [],
    "events": [],
    "created_at": "2026-07-15T12:35:00Z"
  }
}

Authorizations

Authorization

string

header

required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Path Parameters

inbox_id

string<uuid>

required

Email inbox UUID.

message_id

string<uuid>

required

Inbound email message UUID.

Body

application/json

Option 1
Option 2

At least one of text or html must contain a non-whitespace body. Recipients are derived from the source message; caller-supplied to, cc, or bcc values are ignored.

text

string

required

Plain-text reply body.

Minimum string length: 1

Pattern: \S

html

string

HTML reply body.

Minimum string length: 1

Pattern: \S

Response

Reply accepted by the standard email send pipeline.

data

object

required

Show child attributes

suppressed

object[]

Recipients removed by suppression checks when at least one recipient remains and the message is accepted.

Show child attributes

Forward an inbox message

Reply all to an inbox message

⌘I

JavaScript

import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
});

const response = await client.emailInboxes.messages.actions.reply('inbox_id', 'message_id', {
  text: 'text',
});

console.log(response.data);

import os
from telnyx import Telnyx

client = Telnyx(
    api_key=os.environ.get("TELNYX_API_KEY"),  # This is the default and can be omitted
)
response = client.email_inboxes.messages.actions.reply(
    inbox_id="inbox_id",
    message_id="message_id",
    text="text",
)
print(response.data)

package main

import (
	"context"
	"fmt"

	"github.com/team-telnyx/telnyx-go"
	"github.com/team-telnyx/telnyx-go/option"
)

func main() {
	client := telnyx.NewClient(
		option.WithAPIKey("My API Key"),
	)
	response, err := client.EmailInboxes.Messages.Actions.Reply(
		context.TODO(),
		"inbox_id",
		"message_id",
		telnyx.EmailInboxeMessageActionReplyParams{
			Text: telnyx.String("text"),
		},
	)
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", response.Data)
}

package com.telnyx.sdk.example;

import com.telnyx.sdk.client.TelnyxClient;
import com.telnyx.sdk.client.okhttp.TelnyxOkHttpClient;
import com.telnyx.sdk.models.emailInboxes.messages.actions.ActionReplyParams;

public final class Main {
    private Main() {}

    public static void main(String[] args) {
        TelnyxClient client = TelnyxOkHttpClient.fromEnv();

        ActionReplyParams params = ActionReplyParams.builder()
            .text("text")
            .build();
        var response = client.emailInboxes().messages().actions().reply("inbox_id", "message_id", params);
    }
}

require "telnyx"

telnyx = Telnyx::Client.new(api_key: "My API Key")

response = telnyx.email_inboxes.messages.actions.reply("inbox_id", "message_id", text: "text")

puts(response)

<?php

require_once dirname(__DIR__) . '/vendor/autoload.php';

use Telnyx\Client;
use Telnyx\Core\Exceptions\APIException;

$client = new Client(apiKey: getenv('TELNYX_API_KEY') ?: 'My API Key');

try {
  $response = $client->emailInboxes->messages->actions->reply(
    'inbox_id',
    'message_id',
    text: 'text',
  );

  var_dump($response);
} catch (APIException $e) {
  echo $e->getMessage();
}

telnyx email-inboxes:messages:actions reply \
  --api-key 'My API Key' \
  --inbox-id inbox_id \
  --message-id message_id \
  --text text

curl --request POST \
  --url https://api.telnyx.com/v2/email_inboxes/{inbox_id}/messages/{message_id}/actions/reply \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "text": "Thanks for the update."
}
'

{
  "data": {
    "record_type": "email_message",
    "id": "44444444-4444-4444-4444-444444444444",
    "status": "queued",
    "from": {
      "email": "agent@inbox.example.test"
    },
    "to": [
      {
        "email": "reply@example.com"
      }
    ],
    "cc": [],
    "bcc": [],
    "reply_to": null,
    "subject": "Re: Project update",
    "template_id": null,
    "template_variables": {},
    "attachments": [],
    "events": [],
    "created_at": "2026-07-15T12:35:00Z"
  }
}

Getting Started

Domains & DNS

Sending Email

Receiving Email

Email Validations

Templates

Events & Webhooks

Suppressions

Deliverability

Reply to an inbox message

Authorizations

Path Parameters

Body

Response