Mail Checker for Proton Mail

Tracking since May 13, 2026.

Changelog

• Jun 1, 2026
  description

  Mail Checker for Proton Mail — access your encrypted inbox directly from the toolbar.
  
  *BETA*
  
  Website
  https://apps.olausson.de/#mail-checker
  
  Features:
  * Multi-account support with per-account customization (labels, colors, reorder)
  * Read, reply, forward, and compose emails with attachments
  * Rich text editor with formatting toolbar
  * End-to-end encryption for Proton-to-Proton messages
  * OpenPGP attachment decryption — click to open in a new tab or download
  * HTML, plain text, and raw email view modes
  * Calendar invite detection with one-click RSVP (Yes/Maybe/No)
  * Two-factor authentication: TOTP and FIDO2/WebAuthn security keys
  * Mailbox-password / two-password account support
  * Verification code detection with customizable regex patterns (premium)
  * Desktop notifications with custom sound, volume, click actions, and preview-text toggle
  * Custom toolbar badge color
  * Do Not Disturb mode and message snooze (1h, 3h, tomorrow, next week)
  * Three UI themes (Classic, Modern, Material) with Light/Dark/Auto color schemes
  * Adjustable popup size, display density, and pop-out detachable window
  * Custom CSS injection
  * 28 European languages
  * Settings sync across devices via Firefox account
  * Settings export and import (JSON)
  * Mailto: handler registration
  * Credentials encrypted at rest (AES-256-GCM); SRP login (password never leaves your device)
  
  Quick Actions: Mark read/unread, archive, delete, delete permanently, star, label, move to folder, snooze, report spam/phishing, view headers / message details — all from the popup. Drag-to-reorder and show/hide individual actions.
  
  Compose & behavior options: Default compose / reply format (HTML or plain text), open compose in popup or Proton web, image-attachment mode (inline / attach / both), auto-mark-read on actions, auto-advance to next message, 12/24-hour time, sender display format, configurable polling interval, "Send & Archive" toggle, draft auto-save, contact autocomplete, spellcheck.
  
  Privacy: No data collection. All API calls go directly to Proton Mail servers.

  Mail Checker for Proton Mail — access your encrypted inbox directly from the toolbar.
  
  *BETA*
  
  Website
  https://apps.olausson.de/mail_checker_for_proton/
  
  Features:
  * Multi-account support with per-account customization (labels, colors, reorder)
  * Read, reply, forward, and compose emails with attachments
  * Rich text editor with formatting toolbar
  * End-to-end encryption for Proton-to-Proton messages
  * OpenPGP attachment decryption — click to open in a new tab or download
  * HTML, plain text, and raw email view modes
  * Calendar invite detection with one-click RSVP (Yes/Maybe/No)
  * Two-factor authentication: TOTP and FIDO2/WebAuthn security keys
  * Mailbox-password / two-password account support
  * Verification code detection with customizable regex patterns (premium)
  * Desktop notifications with custom sound, volume, click actions, and preview-text toggle
  * Custom toolbar badge color
  * Do Not Disturb mode and message snooze (1h, 3h, tomorrow, next week)
  * Three UI themes (Classic, Modern, Material) with Light/Dark/Auto color schemes
  * Adjustable popup size, display density, and pop-out detachable window
  * Custom CSS injection
  * 28 European languages
  * Settings sync across devices via Firefox account
  * Settings export and import (JSON)
  * Mailto: handler registration
  * Credentials encrypted at rest (AES-256-GCM); SRP login (password never leaves your device)
  
  Quick Actions: Mark read/unread, archive, delete, delete permanently, star, label, move to folder, snooze, report spam/phishing, view headers / message details — all from the popup. Drag-to-reorder and show/hide individual actions.
  
  Compose & behavior options: Default compose / reply format (HTML or plain text), open compose in popup or Proton web, image-attachment mode (inline / attach / both), auto-mark-read on actions, auto-advance to next message, 12/24-hour time, sender display format, configurable polling interval, "Send & Archive" toggle, draft auto-save, contact autocomplete, spellcheck.
  
  Privacy: No data collection. All API calls go directly to Proton Mail servers.

• Jun 1, 2026
  short_description

  Check your Proton Mail inbox. Shows unread count, notifications, and message preview.

  Read, write and manage Proton Mail without opening a tab. Attachments, calendar RSVP, notifications, multi-account.

• Jun 1, 2026
  category

  productivity/communication

  productivity/workflow

• May 18, 2026
  permissions

  alarms, cookies, notifications, storage, clipboardWrite, webRequest, declarativeNetRequestWithHostAccess, scripting, offscreen

  alarms, cookies, notifications, storage, clipboardWrite, scripting, webRequest, declarativeNetRequestWithHostAccess, offscreen

Permissions & access

Permissions

alarmscookiesnotificationsstorageclipboardWritescriptingwebRequestdeclarativeNetRequestWithHostAccessoffscreen

Host access

*://*.proton.me/*

Screenshots