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How to Lock Soliton MailZen on iPhone

iOS 18 Face ID lock and Hidden folder · Soliton Systems Europe N.V. · checked November 2026

Time needed
4 taps
Needs iOS 18 or later

Works for Soliton MailZen whether or not it has its own passcode. No download needed.

Short answer

Touch and hold Soliton MailZen's icon, tap Require Face ID, then confirm. On iOS 18 and later that puts Soliton MailZen behind Face ID, Touch ID or your passcode; choose Hide and Require Face ID instead to move it into App Library's Hidden folder as well.

Lock Soliton MailZen with Face ID

  1. Find Soliton MailZen on your Home Screen or in App Library.
  2. Touch and hold the icon until the quick-actions menu opens.
  3. Tap Require Face ID (or Require Touch ID / Require Passcode, depending on your iPhone).
  4. Tap Require Face ID again to confirm. Soliton MailZen now asks for authentication every time it opens.

To test it, close Soliton MailZen from the App Switcher and open it again. You should see the Face ID prompt before any content appears.

Hide Soliton MailZen in App Library

  1. Touch and hold Soliton MailZen's icon and tap Require Face ID.
  2. Choose Hide and Require Face ID instead of Require Face ID.
  3. Confirm. The icon leaves your Home Screen and moves to the Hidden folder at the bottom of App Library.
  4. To open it later, swipe to App Library, tap Hidden and authenticate.

Hiding also locks the app. To undo either, touch and hold the icon again and choose Don't Require Face ID.

Why lock Soliton MailZen?

Soliton MailZen is a secure email app, the kind of app that tends to hold personal information you would not want on screen if someone borrows your unlocked phone. Email apps see every message and contact. Third-party mail clients may route mail through their own servers to offer features like push or AI summaries.

Business apps often handle other people's data — clients, colleagues and customers — so what they collect can affect more than you.

A lock answers one question — who can open the app on this iPhone. It does not change what Soliton MailZen sends to its developer; for that, see Soliton MailZen's full privacy report.

What the lock does and does not do

It does

  • Ask for Face ID, Touch ID or passcode every time Soliton MailZen opens
  • Hide message previews in notifications
  • Keep Soliton MailZen's content out of Spotlight and Siri suggestions
  • With Hide, remove the icon from the Home Screen

It does not

  • Stop someone who knows your passcode
  • Encrypt or change how Soliton MailZen stores data
  • Sync to your iPad or other devices
  • Remove Soliton MailZen from purchase history or Screen Time reports

Don't see Require Face ID?

  • Update to iOS 18 or later in Settings › General › Software Update.
  • Make sure a passcode is set in Settings › Face ID & Passcode; the lock needs one.
  • Some Apple apps (Settings, Calculator, Camera, Maps, Find My, Clock) cannot be locked or hidden.
  • If your iPhone is managed by work or school, the option may be restricted.

Other settings worth checking for Soliton MailZen

  1. Notifications

    Settings › Notifications › Soliton MailZen › Show Previews: When Unlocked keeps message and account details off the Lock Screen.

Soliton MailZen's full privacy label

App Privacy label Developer-reported · checked November 1, 2026
Data Not Collected

The developer states that no data is collected from this app.

Is Soliton MailZen safe? Every data type explained →

Lock these apps too

After you lock Soliton MailZen

Tick what you have done
Tick each step as you do it on your iPhone.

Done. You have applied every control the label points to.

FAQ

Does Soliton MailZen have its own passcode?
Some apps offer an in-app PIN or biometric lock in their settings. The App Store privacy label does not say whether Soliton MailZen does; the iOS 18 lock works regardless.
What happens to Soliton MailZen's notifications when it is locked?
Locked and hidden apps do not show message previews or content in notifications, and their content does not appear in Spotlight search or Siri suggestions.
Can someone who knows my passcode open a locked app?
Yes. If Face ID fails, the lock falls back to your device passcode. Keep the passcode private if the lock matters to you.
Is a locked Soliton MailZen encrypted?
The lock controls who can open the app on this iPhone. It does not change how the app stores or syncs data. Encryption depends on the developer and on your device passcode.
Why can't I see the Require Face ID option?
You need iOS 18 or later. Some Apple apps such as Settings, Calculator, Maps and Camera cannot be locked or hidden.
Does hiding Soliton MailZen remove it from my purchase history?
No. Hidden apps still appear in App Store purchases and in Settings › Apps, and Screen Time reports still include them.

Is Soliton MailZen safe? Full privacy report →Does Soliton MailZen track you? →Lock an app: A–Z →All business apps →

Facts on this page come from Apple: lock or hide an app on iPhone, as reported by the developer. Checked November 2026. How we collect data · Report a correction