---
title: Deployment use cases for real-time push notifications
slug: emailplus/guide/ios/deployment-use-cases-for-real-time-push-notifications
createdAt: 2026-09-07T11:21:47.537Z
---

This document addresses the following use cases:

- Email+ uses AppTunnel to tunnel EWS traffic to the Exchange server. This setup only supports basic authentication to the EWS service.
- Email+ uses Tunnel to tunnel all traffic to the Exchange server. This setup supports basic, modern auth, and identity certificates to authenticate to the EWS service.

:::hint{type="info"}
If your existing Email+ deployment uses a Standalone Sentry for ActiveSync and your Exchange Web Service (EWS) is set up to use certificates, you have to disable ActiveSync on Standalone Sentry and set up Tunnel.
:::