---
title: "TN3191: IMAP extensions supported by Mail for iOS, iPadOS, and visionOS"
framework: technotes
role: article
role_heading: Article
path: technotes/tn3191-imap-extensions-supported-by-mail
---

# TN3191: IMAP extensions supported by Mail for iOS, iPadOS, and visionOS

Learn which extensions to the RFC 3501 IMAP protocol are supported by Mail for iOS, iPadOS, and visionOS.

## Overview

Overview The IMAP protocol defined in RFC 3501 (IMAP4rev1) is one of the protocols used by Mail for iOS, iPadOS, and visionOS to connect to email servers. To improve efficiency and performance for both the Mail app and email servers, the Mail app supports various extensions to the IMAP protocol. This document is intended for IMAP email server implementers to guide decisions on which extensions to support. For example, the CONDSTORE, IDLE, and ESEARCH extensions are especially important for efficient synchronization. Details Below are the IMAP extensions that Mail for iOS, iPadOS, and visionOS uses, with descriptions of their implementation.  |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |   |  |  Revision History 2025-08-27 First published.

## See Also

### Latest

- [TN3210: Optimizing your app for iPhone Mirroring](technotes/tn3210-optimizing-your-app-for-iphone-mirroring.md)
- [TN3211: Resolving SwiftUI source incompatibilities for State and ContentBuilder](technotes/tn3211-resolving-swiftui-source-incompatibilities-for-state-and-contentbuilder.md)
- [TN3212: Adopting gesture recognizers for Sidecar touch support](technotes/tn3212-adopting-gesture-recognizers-for-sidecar-touch-support.md)
- [TN3208: Preparing your app’s launch screen to meet App Store requirements](technotes/tn3208-preparing-your-apps-launch-screen-to-meet-app-store-requirements.md)
- [TN3205: Low-latency communication with RDMA over Thunderbolt](technotes/tn3205-low-latency-communication-with-rdma-over-thunderbolt.md)
- [TN3206: Updating Apple Pay certificates](technotes/tn3206-updating-apple-pay-certificates.md)
- [TN3179: Understanding local network privacy](technotes/tn3179-understanding-local-network-privacy.md)
- [TN3190: USB audio device design considerations](technotes/tn3190-usb-audio-device-design-considerations.md)
- [TN3194: Handling account deletions and revoking tokens for Sign in with Apple](technotes/tn3194-handling-account-deletions-and-revoking-tokens-for-sign-in-with-apple.md)
- [TN3193: Managing the on-device foundation model’s context window](technotes/tn3193-managing-the-on-device-foundation-model-s-context-window.md)
- [TN3115: Bluetooth State Restoration app relaunch rules](technotes/tn3115-bluetooth-state-restoration-app-relaunch-rules.md)
- [TN3192: Migrating your iPad app from the deprecated UIRequiresFullScreen key](technotes/tn3192-migrating-your-app-from-the-deprecated-uirequiresfullscreen-key.md)
- [TN3151: Choosing the right networking API](technotes/tn3151-choosing-the-right-networking-api.md)
- [TN3111: iOS Wi-Fi API overview](technotes/tn3111-ios-wifi-api-overview.md)
- [TN3134: Network Extension provider deployment](technotes/tn3134-network-extension-provider-deployment.md)