Mac-native reading habits.
Letterboxx is newsletter software for Mac, with a familiar sidebar, focused reader, keyboard-friendly flow, and visual settings that let your newsletter library feel like yours.
Newsletter app for Mac.
Turn the newsletters you already receive into a calm, organized reading library on your Mac.
Your newsletters, minus the inbox.
A dedicated Mac app for the things you actually meant to read.
Clean View does the tidying.
Trim trackers, ads, embeds, and clutter before they reach your eyes.
Highlight like you mean it.
Save the good bits in familiar colors, right where you found them.
Give every newsletter a home.
Letterboxxes work like folders, keeping subscriptions stored, sorted, and out of your inbox.
Flip to the nerdy side.
Reveal sender, source, composition, and Clean View details without leaving the reader.
Let the mail sort itself.
Simple Auto-Delivery rules send recurring newsletters where they belong.
Make the list feel like yours.
Adjust type, density, badges, dates, and status icons until it feels right.
Keep your library tucked away.
Encrypted backups protect newsletters, Letterboxxes, rules, highlights, and settings.
Choose your reading mood.
Light, dark, e-ink, newspaper, Kitty Cat, and more. Because this is a Mac app.
Newsletter app for Mac
The Mac app your newsletters deserved.
Letterboxx is a Mac newsletter app for people who already collect great writing in their inbox but want it to feel more like a reading library than another pile of email. It is also an email newsletter reader and email newsletter app for the subscriptions that arrive through Gmail, iCloud, Outlook, or IMAP.
Local-first by design.
Imported newsletter copies live in your Letterboxx library. Your original messages remain in your email account, and the app is clear about what it has copied and where it came from.
Made for regular readers.
Use Letterboxxes, Auto-Delivery, Clean View, highlights, and search to turn recurring newsletters into a weekly reading routine instead of inbox debt.
Mac reading workflow
A Mac-native home for newsletters, not another tab to manage.
Letterboxx is built as a real Mac app for the newsletters that already arrive in email. Connect the accounts you use, choose the folders that hold newsletter subscriptions, and turn those messages into a local reading library with a familiar sidebar, reader, filters, and settings for reading newsletters on Mac.
Start with the best way to read newsletters on a Mac, then use Letterboxxes to organize email newsletters into the topics you actually read. For the product thinking behind that Mac-first shape, read what I wanted from a Mac newsletter app or browse the full Letterboxx letters; for the practical model, see how Letterboxx works and newsletter backup and restore.
- Start with your existing mail. Use Gmail, iCloud, Outlook, DreamHost, or another IMAP account without moving the original messages.
- Build a local Mac library. Letterboxx imports newsletter copies so reading, highlighting, searching, and organizing happen in the app.
- Read in a Mac-shaped workflow. Use keyboard-friendly navigation, focused views, native settings, and visual themes built for daily desktop reading.
Why Mac matters
Desktop newsletters deserve a desktop reading rhythm.
A Mac newsletter app can feel calmer than a browser tab and more intentional than an inbox folder because the app has one job: keep your subscribed reading visible, organized, and easy to return to.
Mac-first library
Keep long-form reading close to where you work.
- browse Letterboxxes, senders, filters, and saved issues from a native sidebar
- open newsletters in a focused reader instead of a crowded inbox window
- use appearance settings that make regular reading feel comfortable
Local-first control
Use copies for reading while email remains familiar.
- import from selected mail folders instead of treating every message as reading material
- keep originals in Gmail, iCloud, Outlook, or IMAP
- protect the reading library with encrypted backups
Email is for communication.
Letterboxx is for reading.
Your email inbox is built for messages, replies, and triage. Letterboxx is built for essays, digests, roundups, research, and the publications you actually meant to revisit.
How it works
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.
What changes
Your newsletters do not change.
The way you use 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.
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
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
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
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
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
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
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.
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.
Backup + Restore
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.
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
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
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
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
Questions
Newsletter app for Mac FAQ
Is Letterboxx available for Mac?
Yes. Letterboxx is available for Mac on the Mac App Store.
Is Letterboxx still a TestFlight beta?
No. Letterboxx is no longer a public TestFlight beta. The current public version is the Mac app available on the Mac App Store.
Is Letterboxx for iPhone or iPad?
The public Letterboxx app is currently a Mac app. Letterboxx is not positioned as an iPhone or iPad newsletter reader.
Does Letterboxx replace Apple Mail?
No. Apple Mail and other email clients are still for communication. Letterboxx is for reading and organizing newsletters you already receive.
Can Letterboxx import from iCloud, Outlook, or other IMAP accounts?
Yes. Letterboxx can import newsletter copies from Gmail and IMAP accounts, including common providers such as iCloud and Outlook when configured for IMAP access.
Can I read imported newsletters offline?
Imported copies live in your local Letterboxx library, so saved newsletters are available from the app without treating your email account as a live reading surface.
How much does Letterboxx cost?
Letterboxx includes a 14-day free trial, then offers monthly and annual subscription options.
Letterboxx at a glance
A Mac app built for reading email newsletters.
Letterboxx is a Mac newsletter reader that gives email newsletters a calmer place to live, with organization, search, highlights, and a local reading library.
- Available now
- Letterboxx is available now on the Mac App Store and is no longer distributed as a public TestFlight beta. View it on the Mac App Store.
- Built for newsletters
- Collect, organize, search, highlight, and revisit the newsletters you already receive.
- Connects to your email
- Letterboxx securely connects to Gmail, iCloud, Outlook, DreamHost, and other IMAP email accounts.
- Local reading library
- Letterboxx downloads local copies of your newsletters so they're organized, searchable, and ready to read on your Mac.
Letterboxx connects directly to email accounts using IMAP and stores local copies of newsletters on your Mac. Original messages remain on the mail server unless deleted by the user.