Create Letterboxxes for the way you read.
Build spaces for tech, business, local news, personal essays, research, or any topic you follow. Letterboxxes keep subscriptions visible without turning your inbox into the destination.
Newsletters deserve their own app.
Read and organize email newsletters in a dedicated Mac app — not inside your everyday inbox.
Read without living in your inbox.
A calmer reading space for the newsletters you want — not your everyday email.
Turn newsletter clutter into a library.
Create Letterboxxes for topics, writers, projects, or anything you want to keep together.
Let recurring newsletters sort themselves.
Route each sender, subject, or newsletter type to the right Letterboxx automatically.
Remove the clutter. Keep the writing.
Clean View trims trackers, ads, embeds, and messy email HTML for a calmer read.
Highlight what you want to remember.
Save useful passages in familiar colors and find them again later.
Come back to what matters.
Favorite a newsletter, set a reminder, or move it somewhere you’ll find it next.
Protect the library you’re building.
Encrypted backups preserve newsletters, Letterboxxes, rules, highlights, and settings.
See your reading life at a glance.
Track what arrived, what you’ve read, and the library you’re building.
A reader that belongs on your Mac.
Choose light, dark, e-ink, newspaper, and other themes designed for comfortable reading.
Organize email newsletters into a reading library.
Folders in email can help, but they still leave newsletters feeling like email. Letterboxx: Newsletter Reader is a newsletter organizer and email newsletter reader that gives recurring subscriptions topic-based homes, automatic routing, saved highlights, and a calmer place to read in a newsletter app for Mac.
Let recurring newsletters route themselves.
Auto-Delivery rules can send newsletters from regular senders into the right Letterboxx, so organization happens as part of your reading workflow.
Keep the original mail untouched.
Letterboxx downloads local copies from folders you choose. Original messages remain on the mail server unless you delete them, while the newsletter library becomes easier to browse and search.
Turn scattered subscriptions into named collections.
Organizing newsletters inside email usually means more folders, more rules, and more inbox maintenance. Letterboxx moves the reading copy into a dedicated library where Letterboxxes, filters, senders, and highlights make the collection easier to browse without reorganizing the inbox.
For the practical walkthrough, read the guide to organizing newsletters with Letterboxxes, or start with how Letterboxx works if you want the full email-to-library model. For the complete source-to-library story, see how to build your newsletter library. For a more personal version of the same workflow, read how I organize tech, investing, and local newsletters, or browse the full Letterboxx letters.
- Create Letterboxxes for topics. Make collections for the subjects you actually follow, from work research to weekend reading.
- Route repeat senders. Auto-Delivery can send familiar newsletters into the right Letterboxx as new issues arrive.
- Find things later. Use sender filters, highlighted filters, search, and saved reading state to return to older issues.
Jason Snell’s Pick of the Week!
Jason Snell picked Letterboxx as his Pick of the Week on the August 11, 2026 episode of MacBreak Weekly.
Watch Jason Snell talk about Letterboxx on MacBreak Weekly.
MacBreak Weekly © TWiT, LLC. Used with permission. TWiT.tv
More than folders for newsletters.
Gmail labels, Apple Mail folders, and Outlook folders can store newsletters, but a reading library can show what is worth reading, what has already been read, what has useful highlights, and which subscriptions belong together.
Group newsletters around real reading interests.
- make named collections for topics, projects, writers, or recurring beats
- separate subscriptions from transactional email without changing originals
- scan a topic without digging through inbox folders
Return to saved issues without remembering where they landed.
- filter newsletters by sender, favorites, reading state, or highlights
- search across imported newsletter copies
- use backups to protect the collection you have built
Email is for communication.
Letterboxx is for reading.
Your email inbox is built for messages, replies, and triage. Letterboxx is built for newsletters, essays, digests, roundups, research, and the publications you actually meant to read and revisit but didn't and couldn't because your email is a dumpster fire not meant for reading.
Connect your email. Read local copies.
Pick the mail folders that contain the things you want to read. Letterboxx downloads local copies into your Mac reading library, while original messages remain on the mail server unless you delete them.
Your newsletters don't change.
The way you read them does.
Instead of treating every newsletter like another inbox item, Letterboxx turns recurring subscriptions into collections you can read, highlight, search, and keep.
Your inbox is good at
- Sending and receiving messages
- Replying and forwarding
- Processing the inbox
- Getting back to zero
Letterboxx helps you
- Build collections around topics
- Route newsletters automatically
- Highlight useful ideas
- Search across years of saved issues
- Read without inbox chaos
Download Letterboxx for Mac.
Start with 14 days free before deciding.
Take a tour of your newsletter library.
Click through Dashboard, Newsletter, Clean View, Message Diagnostics, Backup & Restore, and Highlights to see how Letterboxx turns email newsletters into a calmer Mac reading space.
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.
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
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
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.
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
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
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.
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
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
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.
Rules that keep the library tidy.
Auto-Delivery routes new arrivals into the right Letterboxx using ordered rules you control.
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.
A real safety net for your reading library.
Create encrypted backups for newsletters, Letterboxxes, Auto-Delivery, highlights, reminders, and settings.
Appearance
Tune Letterboxx to your reading style with theme controls, typography settings, and calmer visual defaults.
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
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
Highlighting
Save important passages in any newsletter, keep them attached to that message, and use View Highlights to jump through them later.
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
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
Organize email newsletters FAQ
What is the best way to organize email newsletters?
For newsletters you actually want to read and keep, a dedicated library works better than inbox folders alone. Letterboxx lets you organize newsletter copies into topic-based Letterboxxes.
Can Letterboxx automatically sort newsletters?
Yes. Auto-Delivery rules can route recurring newsletters into the Letterboxx you choose.
Will Letterboxx clean up my inbox?
Letterboxx is not an inbox-cleaning tool. It gives newsletters their own reading library while the original messages remain in your email account.
Can I keep newsletters by topic?
Yes. You can create Letterboxxes for topics, publications, projects, or any collection that matches how you read.
Can I find saved newsletters later?
Yes. Imported newsletters can be searched, organized, highlighted, and revisited in Letterboxx.