---
title: "Response Queue Service"
slug: "response-queue-service"
status: "update"
updated: 2026-05-28T10:34:57Z
published: 2026-05-28T10:34:57Z
canonical: "docs.mapp.com/response-queue-service"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mapp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Response Queue Service

The Response Queue Service (RQS) provides near real-time access to response events from Mapp Engage through asynchronous API calls. Use it to retrieve email, SMS, and Mobile Push response data, such as bounces, clicks, opens, and unsubscribes, for processing in external CRM, analytics, or dashboard systems.

Compared to a Raw Data Export, response events are available shortly after they occur in Engage.

Typical use cases include polling inbound SMS keywords such as STOP or UNSUBSCRIBE for opt-out processing.

For endpoint details, request and response formats, see the [Async API reference](/apidocs/async).

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## Supported channels

- Email
- SMS
- Mobile Push

Mobile Apps and web responses are not tracked through this service.

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## Available response types

- **Email and SMS:** Sent to MTA (via `pollByType` only), Bounces, Clicks, Forwards, Skips, Feedback, Renders/Opens, Conversions (transactional tracking data), Unsubscribes
- **Mobile Push:** Sendout, Error, Delivery, Dismiss, Click

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## Capabilities

- Retrieve response data via asynchronous API calls.
- Filter by response type, for example Bounces or Clicks.
- Access details for each response type, such as bounce category or click timestamp.
- Link responses to marketing activities such as Group or Message.
- Poll different response types in parallel.
- Retrieve data within a defined time range, once or repeatedly.

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## Data retention and limits

- Events are stored for 30 days. After this period, older responses are overwritten.
- Up to 20,000 responses are returned per retrieval. To retrieve more, repeat the call.

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## Prerequisites

- **Activation:** The Response Queue is configured by Mapp. Contact your customer success or account manager to enable it.
- **API version:** Mapp Engage API v2 version 13 or later is required.

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## Related content

- [Async API reference](/apidocs/async)
- [Set up Response Queue](/docs/set-up-response-queue)
- [Best Practices for Response Queue](/docs/best-practices-for-response-queue)

## Related

- [Set up Response Queue](/set-up-response-queue.md)