Letterboxx dashboard showing newsletter navigation, smart filters, and reading statistics

Letterboxxes

Letterboxxes are your custom newsletter folders inside Letterboxx. Create focused spaces for each topic, then file newsletters manually or route them automatically with Auto-Delivery.

Focused Organization

Give every newsletter a purpose-built home.

Separate your reading stream into intentional Letterboxxes so your inbox stays clean and your best newsletters stay easy to find.

  • Create Letterboxxes for topics, projects, or interests
  • Move newsletters directly into a Letterboxx using the contextual menu or drag and drop
  • Use Auto-Delivery rules to route new messages into the right Letterboxx automatically
Letterboxx workspace showing custom Letterboxxes, smart filters, and newsletter navigation

Quick Access + Simple Setup

Create and manage Letterboxxes in seconds.

Letterboxxes live directly in the sidebar and can be created on demand, so setup and organization stay one click away.

  • Open sidebar actions to create and manage your Letterboxxes instantly
  • Name and configure a new Letterboxx in a focused modal flow
  • Keep your Letterboxx system aligned with how you actually read using sort or drag and drop
Letterboxx newsletter list settings for focused sidebar and list behavior
Letterboxx settings window for shaping workspace behavior

Clean View

Newsletters should feel like reading, not like loading a miniature website full of scripts, embeds, and tracking pixels. Clean View gives you a calmer reader with visible privacy reporting.

Cleaner Reading

Strip the noise before it reaches your attention.

Clean View removes common newsletter clutter and keeps a local audit of what was taken out so the reader stays fast, quiet, and explainable.

  • Blocks or sanitizes trackers, ads, scripts, autoplay media, embeds, and remote images
  • Tracks per-message, sender, and all-newsletter removal counts
  • Offers Off, Medium, High, and Custom privacy modes for different reading preferences
Letterboxx reader in Clean View with newsletter content shown in the main app window

Privacy Report

See the work happening behind the quiet.

The Clean View settings pane surfaces cumulative totals and attribution so privacy protection feels transparent instead of mysterious.

  • Totals for observed messages, sanitizer removals, trackers and ads, and privacy intelligence
  • Source attribution for blocking-list matches when Letterboxx can map them locally
  • Backfill tools for keeping Clean View reporting accurate across older newsletters
Letterboxx Clean View settings showing privacy mode and removal reporting

Diagnostics without leaving the reader.

When a newsletter looks different than expected, Letterboxx can explain the message, Clean View changes, delivery state, and source details right beside the reading flow.

Message Diagnostics

Inspect the current newsletter inline.

Message Diagnostics now flips into the reader pane, so you can understand a selected newsletter without opening a separate utility window.

  • Review identity, composition, raw source availability, and Clean View summary details
  • Use the same toolbar and keyboard path from the reader
  • Keep diagnostics tied to the newsletter you are already reading
Letterboxx reader showing inline Message Diagnostics for a selected newsletter

Activity Center

Keep delivery and maintenance visible.

Activity Center gives important app events a dedicated place, so import, routing, highlight, and maintenance details stay understandable.

  • Review recent activity when delivery or rendering needs context
  • Keep diagnostics and operational events separate from focused reading
Letterboxx Activity Center settings window with app events and maintenance context

Automation, accounts, and safekeeping.

Letterboxx is still local-first, but it gives you practical controls for routing newsletters, importing copies from mail accounts, choosing read-status behavior, and protecting your library.

Auto-Delivery

Rules that keep the library tidy.

Auto-Delivery routes new arrivals into the right Letterboxx using ordered rules you control.

Letterboxx Auto-Delivery settings window with newsletter routing rules

Accounts + Sync

Clear setup, honest sync status.

Connect Gmail or IMAP accounts, import newsletter copies from selected folders, and see what iCloud-backed continuity can do when available.

Letterboxx Sync settings window explaining newsletter library and account continuity

Backup + Restore

A real safety net for your reading library.

Create encrypted backups for newsletters, Letterboxxes, Auto-Delivery, highlights, reminders, and settings.

Letterboxx Backup and Restore settings window for protecting newsletter data

Appearance

Tune Letterboxx to your reading style with theme controls, typography settings, and calmer visual defaults.

Visual Theme

Choose the look that matches how you read.

Switch themes instantly and keep your reading experience aligned with your environment and focus level.

  • Theme modes include System, Light, Dark, Newspaper, E-Ink, and Tiger
  • Quickly preview and switch without leaving your reading flow
Letterboxx appearance settings window with theme and layout options

Newsletter List

Tune sizing, density, and visible detail.

Adjust the newsletter list so it surfaces exactly the information you want at a glance.

  • Choose the list font and row density
  • Set subject size, secondary text size, and sender badge size independently
  • Toggle sender name, date and time, status indicators, and unread indicator visibility
Newsletter list appearance controls in Letterboxx settings
General Letterboxx settings for workspace behavior

Highlighting

Save important passages in any newsletter, keep them attached to that message, and use View Highlights to jump through them later.

Mark what's important

Save the passages worth coming back to

Select text in the reader and save it as a highlight without leaving the newsletter.

  • Highlights stay attached to the newsletter where you saved them
  • Use View Highlights to jump through saved passages in order
  • Recolor or remove highlights whenever you revisit the message
Letterboxx highlight workflow showing selected passages and highlight actions

Persistent Recall

Find newsletters with saved highlights later.

The Highlighted filter shows newsletters that contain saved highlights, so the ideas you marked are easy to find again.

  • Highlights persist per message across app sessions
  • The Highlighted filter shows newsletters with saved highlights
  • Recolor or remove highlights whenever you revisit the message
Letterboxx sidebar and reader with highlighted content visible