What is an email newsletter reader?
An email newsletter reader is a purpose-built place for newsletters that arrive by email. Instead of mixing reading with replies and alerts, Letterboxx keeps newsletter copies in a Mac reading library.
Email newsletter reader.
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.
Email newsletter reader
A dedicated email newsletter reader for your Mac.
Yes. Letterboxx is an app just for newsletters you already receive. It gives their saved copies a quiet Mac reading library while the original emails stay in your email account.
Stop treating long-form newsletters like inbox chores. Letterboxx is a newsletter reading app that gives email newsletters their own quiet space where saved issues can be read, cleaned up, highlighted, searched, and revisited outside the inbox. If you are choosing a workflow, start with the best way to read newsletters on a Mac; if messy newsletter HTML is the part that slows you down, read the Clean View guide; if saving useful ideas matters most, see how to highlight email newsletters. For the product thinking behind the reader, read Why Newsletters Feel Different From Email.
Why newsletters get lost in email apps.
In normal email, newsletters sit beside bills, receipts, work threads, and automated notices. Letterboxx separates the reading habit from inbox maintenance.
Clean reading, highlights, and search.
Use Clean View for messy newsletter HTML, save the passages worth keeping, and search your local newsletter library when an idea comes back around.
How the reader works
Connect email once, then read newsletters as a library.
Letterboxx connects to Gmail, iCloud, Outlook, DreamHost, or custom IMAP accounts, then downloads local newsletter copies from the folders you choose. Original messages remain on the mail server unless you delete them, while Letterboxx gives the reading copy a calmer home on your Mac. Gmail readers can start with the Gmail newsletter reader page or the Gmail newsletter import guide, and long-term collectors should also review newsletter backup and restore.
- Choose source folders. Pick the labels or folders that contain newsletters, not every folder in the account.
- Import local copies. Letterboxx builds a Mac reading library while originals remain in Gmail, iCloud, Outlook, or IMAP.
- Read with context. Clean View, Message Diagnostics, highlights, and search live beside the newsletter workflow.
Reader details
What makes it a reader instead of another inbox.
The useful difference is not just where newsletters appear. It is what you can do with them after they arrive.
Clean View
Make messy newsletter HTML easier to finish.
- trim common trackers, ads, embeds, and remote media
- compare the original view whenever you need to
- review what changed in Message Diagnostics
Highlights and search
Keep ideas findable after the inbox moves on.
- save passages directly from the reader
- use Highlighted and other filters to return later
- search the local newsletter library when an idea comes back
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
Email newsletter reader FAQ
Is Letterboxx a newsletter reader or an email client?
Letterboxx is a newsletter reader. It imports newsletter copies from selected mail folders, then gives them a dedicated reading and organization space on your Mac.
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 delete or move my newsletters in email?
No. Letterboxx connects to your email account using IMAP and downloads local newsletter copies into a reading library on your Mac. Original messages remain on the mail server unless you explicitly delete them.
Can I use Letterboxx with Gmail?
Yes. Letterboxx can connect to Gmail and IMAP accounts so you can import copies from the folders that contain your newsletters.
What is the best way to read newsletters on a Mac?
The best way to read newsletters on a Mac is to separate reading from inbox maintenance. Letterboxx imports newsletter copies into a local Mac reading library so you can read, organize, highlight, and search them outside the inbox.
Can I use Letterboxx as a Gmail newsletter reader?
Yes. Letterboxx can work as a Gmail newsletter reader by importing local copies from the Gmail labels or folders you choose while the original messages stay in Gmail.
Can I use Letterboxx with iCloud, Outlook, or other IMAP accounts?
Yes. Letterboxx supports Gmail, iCloud, Outlook, DreamHost, and custom IMAP accounts when the account can provide access to the folders that contain newsletters.
What does Clean View do?
Clean View trims common newsletter clutter such as trackers, ads, embeds, remote media, and messy email HTML so long-form reading feels calmer.
Can I search old newsletters?
Yes. Imported newsletters become part of a local library you can organize, highlight, and search later.
Does importing newsletters mark them read in email?
No. Importing uses a read-safe fetch. Read/unread exchange only happens if you choose a per-account read-status mode that sends or syncs read status.
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.