Add labels to an inbox message

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.labels.create('inbox_id', 'message_id', {
  labels: [],
});

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.labels.create(
    inbox_id="inbox_id",
    message_id="message_id",
    labels=[],
)
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"),
	)
	label, err := client.EmailInboxes.Messages.Labels.New(
		context.TODO(),
		"inbox_id",
		"message_id",
		telnyx.EmailInboxeMessageLabelNewParams{
			Labels: "labels",
		},
	)
	if err != nil {
		panic(err.Error())
	}
	fmt.Printf("%+v\n", label.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.labels.LabelCreateParams;
import java.util.List;

public final class Main {
    private Main() {}

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

        LabelCreateParams params = LabelCreateParams.builder()
            .labels(List.of())
            .build();
        var response = client.emailInboxes().messages().labels().create("inbox_id", "message_id", params);
    }
}

require "telnyx"

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

response = telnyx.email_inboxes.messages.labels.create("inbox_id", "message_id", labels: [])

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->labels->create(
    'inbox_id',
    'message_id',
    labels: [],
  );

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

telnyx email-inboxes:messages:labels create \
  --api-key 'My API Key' \
  --inbox-id inbox_id \
  --message-id message_id \
  --labels labels

curl --request POST \
  --url https://api.telnyx.com/v2/email_inboxes/{inbox_id}/messages/{message_id}/labels \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "labels": [
    "spam",
    "urgent"
  ]
}
'

{
  "data": {
    "id": "55555555-5555-5555-5555-555555555555",
    "record_type": "email_message",
    "direction": "inbound",
    "status": "received",
    "inbox_id": "11111111-1111-1111-1111-111111111111",
    "thread_id": "33333333-3333-3333-3333-333333333333",
    "message_id": "<message@example.com>",
    "in_reply_to": "<earlier@example.com>",
    "references": [
      "<earlier@example.com>"
    ],
    "from": {
      "email": "alice@example.com",
      "name": "Alice"
    },
    "to": [
      {
        "email": "agent@inbox.example.test"
      }
    ],
    "cc": [],
    "bcc": [],
    "reply_to": [],
    "subject": "Project update",
    "text_body_url": null,
    "html_body_url": null,
    "reply_text": "Thanks, I will send it today.",
    "has_quoted_text": true,
    "headers": {},
    "inline_files": [],
    "attachments": [],
    "labels": [
      "spam",
      "urgent"
    ],
    "read_at": null,
    "received_at": "2026-07-15T12:30:00Z",
    "sent_at": null,
    "created_at": "2026-07-15T12:30:00Z",
    "updated_at": "2026-07-15T12:30:00Z"
  }
}

{
  "errors": [
    {
      "code": "10006",
      "title": "Not authorized",
      "detail": "Invalid API key",
      "meta": {
        "url": "https://developers.telnyx.com/docs/overview/errors/10006"
      }
    }
  ]
}

{
  "errors": [
    {
      "code": "10001",
      "title": "Not Found",
      "detail": "The requested resource was not found"
    }
  ]
}

{
  "errors": [
    {
      "code": "10015",
      "title": "Validation Failed",
      "detail": "subject can't be blank",
      "source": {
        "pointer": "/data/attributes/subject"
      }
    }
  ]
}

{
  "errors": [
    {
      "code": "10016",
      "title": "Service Unavailable",
      "detail": "Inbox labels are temporarily unavailable. Please try again later."
    }
  ]
}