A Kojya app
Maskbox
Your Fastmail masked email, on your terms.
Create, activate, block, and delete Fastmail masked email aliases from your iPhone and iPad — plus widgets, a Control Center button, and Siri. All with complete privacy.
A closer look
Your aliases at a glance — on the Home Screen, in widgets, and a tap from Control Center.
Create and manage aliases
Spin up a new masked address, then activate, block, or delete any alias in a tap. Every change syncs straight to Fastmail.
Home Screen widgets
Keep your most-used aliases a glance away, and act on them without opening the app.
Control Center button
Add a Maskbox button to Control Center or the Lock Screen to create or toggle an alias the moment you need one.
Siri and Shortcuts
App Intents and Siri Shortcuts let you create or toggle aliases by voice or as part of any automation.
Works offline
Your aliases are cached on-device, so widgets and Shortcuts keep showing them even with no connection. Changes sync when you're back online.
Private by design
Your Fastmail API token lives in the device keychain and is used only to talk to Fastmail. No analytics, no tracking, no third-party SDKs.