# readinbox — Complete Reference

> Convert email newsletters to EPUB and deliver them to your e-reader automatically.

readinbox (https://readinbox.io) is a web service that converts email newsletters into clean EPUB files and delivers them to Kindle, Kobo, PocketBook, BOOX, and reMarkable e-readers. Forward your newsletters to a unique readinbox address, and they arrive on your e-reader within minutes — no manual steps required.

## Table of Contents

- [How It Works](#how-it-works)
- [Kindle](#kindle)
- [Kobo](#kobo)
- [PocketBook](#pocketbook)
- [BOOX](#boox)
- [reMarkable](#remarkable)
- [Email to EPUB Conversion](#email-to-epub-conversion)
- [Email to PDF Conversion](#email-to-pdf-conversion)
- [Auto-Forwarding Setup Guide](#auto-forwarding-setup-guide)
- [Pricing and Plans](#pricing-and-plans)
- [Contact](#contact)

---

## How It Works

1. **Forward Your Newsletters** — Forward newsletters to your unique readinbox address. Works with Gmail, Outlook, Apple Mail, and more.
2. **We Convert to EPUB** — readinbox automatically strips tracking pixels, cleans formatting, and converts each newsletter into a beautiful EPUB file optimized for e-ink screens.
3. **Read on Your Device** — Your newsletter arrives on your e-reader within minutes. Read comfortably with adjustable fonts, no ads, and no distractions.

---

## Kindle

readinbox converts your email newsletters into clean EPUB files and delivers them directly to your Kindle. No manual work required.

### How Email to Kindle Works

1. **Forward Newsletters** — Set up a forwarding rule in Gmail, Outlook, Apple Mail, or any email provider to send newsletters to your readinbox address.
2. **Add Your Kindle Email** — Enter your @kindle.com email address in readinbox. Approve readinbox in your Amazon settings.
3. **Read on Kindle** — Each newsletter appears on your Kindle automatically. Read with adjustable fonts, no ads, and no screen glare.

### Why Read Newsletters on Kindle?

- **No Distractions** — No notifications, no ads, no social media. Just you and the content, on a screen designed for reading.
- **Easy on the Eyes** — E-ink displays reduce eye strain compared to phones and laptops. Read for hours in any lighting condition.
- **Clean Formatting** — readinbox strips tracking pixels, removes email clutter, and produces beautifully formatted EPUB files optimized for e-ink.
- **All Kindle Models Supported** — Works with Kindle Paperwhite, Oasis, Scribe, and all other models that support Send-to-Kindle.

### Kindle FAQ

**Q: How do I send email newsletters to my Kindle?**
A: Forward your newsletters to your unique readinbox email address. readinbox converts them to EPUB and sends them to your Kindle via Amazon's Send-to-Kindle service automatically.

**Q: Can I read Substack on Kindle?**
A: Yes. Forward your Substack newsletters to readinbox and they will be converted to clean EPUB files and delivered directly to your Kindle.

**Q: What is Send-to-Kindle and how does readinbox use it?**
A: Send-to-Kindle is Amazon's service that lets you email documents to your Kindle. readinbox uses your @kindle.com address to deliver converted newsletters automatically.

**Q: Does email to Kindle work with all Kindle models?**
A: Yes. readinbox works with all Kindle models that support Send-to-Kindle, including Kindle Paperwhite, Oasis, Scribe, and the basic Kindle.

---

## Kobo

readinbox converts your email newsletters into EPUB files and delivers them to your Kobo e-reader via Dropbox or Google Drive.

### How Email to Kobo Works

1. **Forward Newsletters** — Set up a forwarding rule to send newsletters to your readinbox address. Works with Gmail, Outlook, Apple Mail, and more.
2. **Connect Dropbox or Google Drive** — Link your Dropbox or Google Drive account. readinbox will upload EPUB files to your sync folder automatically.
3. **Read on Kobo** — Your Kobo syncs with Dropbox or Google Drive. Newsletters appear in your library ready to read.

### Two Ways to Sync to Kobo

**Dropbox** — Connect your Dropbox account and readinbox uploads EPUB files directly to your Kobo sync folder. Files appear on your device over Wi-Fi. Native Kobo Dropbox integration with automatic sync and one-click OAuth setup.

**Google Drive** — Connect your Google Drive account for newer Kobo models (Libra Colour, Clara Colour, and others) that support Google Drive sync. EPUB files are uploaded to your configured folder. One-click OAuth setup.

### Why Read Newsletters on Kobo?

- **Open EPUB Support** — Kobo natively supports EPUB — the open e-book standard. No proprietary format conversion needed.
- **Distraction-Free Reading** — Read on an e-ink screen with no notifications or ads. Adjust fonts, margins, and line spacing to your preference.
- **Clean Formatting** — readinbox strips tracking pixels, removes email clutter, and optimizes formatting for e-ink screens.
- **All Kobo Models Supported** — Works with Kobo Libra, Clara, Sage, Elipsa, and all models that support Dropbox or Google Drive sync.

### Kobo FAQ

**Q: How do I send email newsletters to my Kobo?**
A: Forward your newsletters to your unique readinbox email address. readinbox converts them to EPUB and syncs them to your Kobo via Dropbox or Google Drive automatically.

**Q: Can I read Substack on Kobo?**
A: Yes. Forward your Substack newsletters to readinbox and they will be converted to EPUB and delivered to your Kobo. It works with any Substack publication.

**Q: What format does Kobo use for e-books?**
A: Kobo natively supports EPUB — the open e-book standard. readinbox converts your email newsletters directly to EPUB, so no additional format conversion is needed.

**Q: Do I need a computer to transfer newsletters to Kobo?**
A: No. With Dropbox or Google Drive sync, newsletters appear on your Kobo automatically over Wi-Fi. No USB cable or computer required.

---

## PocketBook

readinbox converts your email newsletters into EPUB files and delivers them to your PocketBook e-reader via Dropbox or Google Drive.

### How Email to PocketBook Works

1. **Forward Newsletters** — Set up a forwarding rule to send newsletters to your readinbox address. Works with Gmail, Outlook, Apple Mail, and more.
2. **Connect Dropbox or Google Drive** — Link your Dropbox or Google Drive account. readinbox will upload EPUB files to your sync folder automatically.
3. **Read on PocketBook** — Your PocketBook syncs with Dropbox or Google Drive. Newsletters appear in your library ready to read.

### Two Ways to Sync to PocketBook

**Dropbox** — Connect your Dropbox account and readinbox uploads EPUB files directly to your PocketBook sync folder. Files appear on your device over Wi-Fi. Native PocketBook Dropbox integration with automatic sync and one-click OAuth setup.

**Google Drive** — Connect your Google Drive account for PocketBook models that support Google Drive sync. EPUB files are uploaded to your configured folder. One-click OAuth setup.

### Why Read Newsletters on PocketBook?

- **Open EPUB Support** — PocketBook natively supports EPUB — the open e-book standard. No proprietary format conversion needed.
- **Distraction-Free Reading** — Read on an e-ink screen with no notifications or ads. Adjust fonts, margins, and line spacing to your preference.
- **Clean Formatting** — readinbox strips tracking pixels, removes email clutter, and optimizes formatting for e-ink screens.
- **Built-in Cloud Sync** — PocketBook has native Dropbox and Google Drive support built in — no sideloading or extra apps needed.

### PocketBook FAQ

**Q: How do I send email newsletters to my PocketBook?**
A: Forward your newsletters to your unique readinbox email address. readinbox converts them to EPUB and syncs them to your PocketBook via Dropbox or Google Drive automatically.

**Q: Can I read Substack on PocketBook?**
A: Yes. Forward your Substack newsletters to readinbox and they will be converted to EPUB and delivered to your PocketBook. It works with any Substack publication.

**Q: Which PocketBook models support cloud sync?**
A: Most PocketBook models support Dropbox and Google Drive sync, including the PocketBook Era, InkPad, and Touch series. Check your device settings for cloud sync options.

**Q: Do I need a computer to transfer newsletters to PocketBook?**
A: No. With Dropbox or Google Drive sync, newsletters appear on your PocketBook automatically over Wi-Fi. No USB cable or computer required.

---

## BOOX

readinbox converts your email newsletters into EPUB files and delivers them to your BOOX e-reader via Google Drive or Dropbox.

### How Email to BOOX Works

1. **Forward Newsletters** — Set up a forwarding rule to send newsletters to your readinbox address. Works with Gmail, Outlook, Apple Mail, and more.
2. **Connect Google Drive or Dropbox** — Link your Google Drive or Dropbox account. readinbox will upload EPUB files to your sync folder automatically.
3. **Read on BOOX** — Your BOOX syncs with Google Drive or Dropbox. Newsletters appear in your library ready to read.

### Two Ways to Sync to BOOX

**Google Drive** — Connect your Google Drive account and readinbox uploads EPUB files to your BOOX sync folder. BOOX devices have built-in Google Drive support for seamless syncing. One-click OAuth setup.

**Dropbox** — Connect your Dropbox account and readinbox uploads EPUB files directly to your configured folder. Install the Dropbox app on your BOOX for automatic syncing. One-click OAuth setup.

### Why Read Newsletters on BOOX?

- **Large E-Ink Displays** — BOOX offers some of the largest e-ink screens available, perfect for reading newsletters with images and complex layouts.
- **Distraction-Free Reading** — Read on an e-ink screen with no notifications or ads. Adjust fonts, margins, and line spacing to your preference.
- **Clean Formatting** — readinbox strips tracking pixels, removes email clutter, and optimizes formatting for e-ink screens.
- **Open EPUB Support** — BOOX natively supports EPUB — the open e-book standard. Use the built-in NeoReader or your favorite reading app.

### BOOX FAQ

**Q: How do I send email newsletters to my BOOX?**
A: Forward your newsletters to your unique readinbox email address. readinbox converts them to EPUB and syncs them to your BOOX via Google Drive or Dropbox automatically.

**Q: Can I read Substack on BOOX?**
A: Yes. Forward your Substack newsletters to readinbox and they will be converted to EPUB and delivered to your BOOX. It works with any Substack publication.

**Q: Which BOOX models are supported?**
A: readinbox works with all BOOX e-readers that support Google Drive or Dropbox sync, including the BOOX Tab, Note, Poke, and Page series.

**Q: Do I need a computer to transfer newsletters to BOOX?**
A: No. With Google Drive or Dropbox sync, newsletters appear on your BOOX automatically over Wi-Fi. No USB cable or computer required.

---

## reMarkable

readinbox converts your email newsletters into EPUB files and delivers them to your reMarkable tablet via Dropbox or Google Drive.

### How Email to reMarkable Works

1. **Forward Newsletters** — Set up a forwarding rule to send newsletters to your readinbox address. Works with Gmail, Outlook, Apple Mail, and more.
2. **Connect Dropbox or Google Drive** — Link your Dropbox or Google Drive account. readinbox will upload EPUB files to your sync folder automatically.
3. **Read on reMarkable** — Your reMarkable syncs with Dropbox or Google Drive. Newsletters appear in your library ready to read.

### Two Ways to Sync to reMarkable

**Dropbox** — Connect your Dropbox account and readinbox uploads EPUB files to your reMarkable sync folder. Files appear on your device over Wi-Fi. One-click OAuth setup.

**Google Drive** — Connect your Google Drive account and readinbox uploads EPUB files to your configured folder. Your reMarkable syncs automatically. One-click OAuth setup.

### Why Read Newsletters on reMarkable?

- **Paper-Like Reading** — The reMarkable's paper-like display provides the most natural reading experience of any e-reader. Perfect for long-form newsletters.
- **Distraction-Free Reading** — No apps, no notifications, no social media. reMarkable is designed purely for reading and writing.
- **Clean Formatting** — readinbox strips tracking pixels, removes email clutter, and optimizes formatting for e-ink screens.
- **Annotate While You Read** — Use reMarkable's stylus to highlight and annotate your newsletters as you read — something you can't do on a phone or laptop.

### reMarkable FAQ

**Q: How do I send email newsletters to my reMarkable?**
A: Forward your newsletters to your unique readinbox email address. readinbox converts them to EPUB and syncs them to your reMarkable via Dropbox or Google Drive automatically.

**Q: Can I read Substack on reMarkable?**
A: Yes. Forward your Substack newsletters to readinbox and they will be converted to EPUB and delivered to your reMarkable. It works with any Substack publication.

**Q: Which reMarkable models are supported?**
A: readinbox works with the reMarkable 2 and reMarkable Paper Pro that support Dropbox or Google Drive integration.

**Q: Do I need a computer to transfer newsletters to reMarkable?**
A: No. With Dropbox or Google Drive integration, newsletters appear on your reMarkable automatically over Wi-Fi. No USB cable or computer required.

---

## Email to EPUB Conversion

readinbox converts your email newsletters into clean, beautifully formatted EPUB files. Forward any newsletter and get an e-reader optimized file delivered automatically.

### How Email to EPUB Conversion Works

1. **Forward Your Email** — Set up a forwarding rule to send newsletters to your readinbox address. Works with Gmail, Outlook, Apple Mail, and any email provider.
2. **Automatic EPUB Conversion** — readinbox strips tracking pixels, removes email clutter, and converts each newsletter into a clean EPUB file optimized for e-ink screens.
3. **Read Anywhere** — Your EPUB file is delivered to your Kindle or Kobo automatically, or download it from your dashboard to read on any device.

### Works With Any Email Newsletter

- **Substack** — Convert Substack newsletters to EPUB. All formatting, images, and links are preserved.
- **Beehiiv** — Beehiiv newsletters are converted with clean formatting optimized for e-ink displays.
- **Ghost & Others** — Ghost, ConvertKit, Mailchimp, Buttondown, and any email newsletter platform is supported.

### Email to EPUB FAQ

**Q: How do I convert email to EPUB?**
A: Forward your email newsletter to your unique readinbox address. readinbox automatically strips tracking, cleans formatting, and converts it into a well-formatted EPUB file.

**Q: What is the difference between EPUB and PDF?**
A: EPUB supports reflowable text with adjustable fonts, making it ideal for e-readers. PDF preserves fixed layouts, better for archiving and printing. readinbox supports both.

**Q: What email newsletters can I convert to EPUB?**
A: readinbox works with any email newsletter including Substack, Beehiiv, ConvertKit, Mailchimp, Ghost, Buttondown, and more. If it arrives as an email, we can convert it.

**Q: Where can I read the EPUB files?**
A: readinbox can deliver EPUB files directly to your Kindle or Kobo e-reader. You can also download them from your dashboard to read on any device that supports EPUB.

---

## Email to PDF Conversion

readinbox converts your email newsletters into clean PDF files. Forward any newsletter and download a beautifully formatted PDF — or get it as EPUB for your e-reader.

### How Email to PDF Conversion Works

1. **Forward Your Email** — Set up a forwarding rule to send newsletters to your readinbox address. Works with Gmail, Outlook, Apple Mail, and any email provider.
2. **Automatic PDF Conversion** — readinbox strips tracking pixels, removes email clutter, and converts each newsletter into a clean PDF file with preserved layout and images.
3. **Download or Deliver** — Download the PDF from your dashboard, or let readinbox deliver it as EPUB to your Kindle or Kobo automatically.

### PDF vs EPUB — Which Format Is Right for You?

**PDF:**
- Preserves original email layout
- Great for archiving and printing
- Fixed page size — no text reflow
- Works on any device with a PDF reader

**EPUB (Recommended for e-readers):**
- Reflowable text — adapts to any screen
- Adjustable fonts, margins, and spacing
- Optimized for e-ink displays
- Native support on Kindle and Kobo

readinbox supports both formats. Choose PDF to preserve layouts, or EPUB for reflowable text on e-readers.

### Email to PDF FAQ

**Q: How do I convert email to PDF?**
A: Forward your email newsletter to your unique readinbox address. readinbox automatically strips tracking, cleans formatting, and converts it into a downloadable PDF file.

**Q: Can I also get EPUB instead of PDF?**
A: Yes. readinbox converts newsletters to both EPUB and PDF. EPUB is ideal for e-readers like Kindle and Kobo with reflowable text and adjustable fonts. PDF preserves the original layout.

**Q: What email newsletters can I convert to PDF?**
A: readinbox works with any email newsletter including Substack, Beehiiv, ConvertKit, Mailchimp, Ghost, Buttondown, and more. If it arrives as an email, we can convert it.

**Q: Can I send the PDF to my e-reader?**
A: You can send PDFs to your Kindle via Send-to-Kindle. However, for the best e-reader experience we recommend EPUB — it supports reflowable text and adjustable fonts on Kindle and Kobo.

---

## Auto-Forwarding Setup Guide

Auto-forwarding sends a copy of your newsletters to readinbox automatically. Set it up once and every new issue is converted to EPUB and delivered to your e-reader.

### Before You Start

You'll need your unique readinbox forwarding address. Sign up or log in, then find it on the Settings page. It looks like yourname@in.readinbox.io.

### Gmail Setup

1. Open Gmail and click the gear icon, then "See all settings".
2. Go to the "Forwarding and POP/IMAP" tab and click "Add a forwarding address".
3. Enter your readinbox forwarding address and confirm via the verification email Gmail sends.
4. Go back to "See all settings" and open the "Filters and Blocked Addresses" tab.
5. Click "Create a new filter". In the "From" field, enter the newsletter sender's email address.
6. Click "Create filter", check "Forward it to", select your readinbox address, and save.

Tip: Repeat steps 5–6 for each newsletter you want on your e-reader. You can also use "OR" in the From field to combine multiple senders into one filter.

### Outlook / Hotmail Setup

1. Open Outlook and go to Settings > Mail > Rules.
2. Click "Add new rule" and give it a name (e.g. "Forward to readinbox").
3. Set the condition: "From" contains the newsletter sender's address.
4. Set the action: "Forward to" and enter your readinbox forwarding address.
5. Click "Save". New emails from that sender will be forwarded automatically.

Tip: You can add multiple senders to the same rule by adding more "From" conditions with "or".

### Apple Mail (iCloud) Setup

1. Go to icloud.com/mail and sign in with your Apple ID.
2. Click the gear icon and select "Rules".
3. Click "Add a Rule".
4. Set the condition: "If a message is from" and enter the newsletter sender's address.
5. Set the action: "Forward to" and enter your readinbox forwarding address. Click "Done".

Tip: iCloud rules run on Apple's servers, so forwarding works even when your Mac is off.

### Other Email Providers

Most email providers support rules or filters. Look for "Rules", "Filters", or "Forwarding" in your provider's settings. The setup is the same:

1. Create a new rule or filter.
2. Set the condition to match the newsletter sender's email address.
3. Set the action to forward matching emails to your readinbox address.

### Tips for Best Results

- **Forward Per Sender** — Create one forwarding rule per newsletter. This gives you full control over which newsletters reach your e-reader.
- **Avoid Blanket Forwarding** — Don't forward all email to readinbox. Use filters to target specific newsletter senders so only relevant content is converted.
- **Test With One Newsletter** — Start by forwarding a single newsletter. Once it arrives on your e-reader, add more senders to your forwarding rules.

### Auto-Forwarding FAQ

**Q: Where do I find my readinbox forwarding address?**
A: After signing up, your unique forwarding address is shown on the Settings page and during onboarding. It looks like yourname@in.readinbox.io.

**Q: Can I forward all my email to readinbox?**
A: We recommend forwarding only newsletters, not all email. Use filters or rules in your email provider to forward specific senders. readinbox processes newsletter content — personal emails and other messages will be ignored.

**Q: What if my email provider isn't listed here?**
A: Most email providers support rules or filters that can forward messages to another address. Look for "Rules", "Filters", or "Forwarding" in your provider's settings. The key step is the same: forward emails from your newsletter sender to your readinbox address.

**Q: Do I need to keep the forwarding rule active?**
A: Yes. The forwarding rule tells your email provider to send a copy of each newsletter to readinbox. If you disable or delete the rule, new newsletters will stop being forwarded.

**Q: Will I still receive newsletters in my inbox?**
A: Yes. Forwarding sends a copy to readinbox — the original email stays in your inbox unless you add an action to archive or delete it in your filter rule.

---

## Pricing and Plans

Simple, transparent pricing. Start free, upgrade when you need more newsletters delivered to your e-reader.

### Free — $0/month
- 5 newsletters per month
- 1 device
- EPUB conversion
- Kindle delivery
- Kobo delivery (Dropbox and Google Drive)
- Manual download
- Newsletter management

### Reader — $8/month
- 50 newsletters per month
- 2 devices
- Everything in Free
- Annual billing: save 20%

### Library — $14/month
- Unlimited newsletters
- Unlimited devices
- Everything in Reader
- Priority support
- Annual billing: save 20%

Cancel anytime. No contracts, no hidden fees. No credit card required to start.

---

## How to Read Substack on Kindle

Yes, you can read Substack newsletters on your Kindle. Substack doesn't have a Kindle app, but there are several ways to get your newsletters onto your e-reader.

### Method 1: readinbox (Recommended — Fully Automatic)

Forward your Substack newsletters to readinbox once. Every new issue is automatically converted to a clean EPUB and delivered to your Kindle via Send-to-Kindle. No manual steps after initial setup.

How to set it up:
1. Sign up free at readinbox.io and get your unique forwarding address.
2. Add your @kindle.com email address in readinbox and approve readinbox in your Amazon Send-to-Kindle settings.
3. Set up a forwarding rule in Gmail, Outlook, or Apple Mail to send Substack newsletters to your readinbox address.

Pros: Fully automatic, clean EPUB optimized for e-ink, strips tracking pixels, works with any Substack.
Cons: Free plan limited to 5 newsletters/month.

### Method 2: Send to Kindle Browser Extension (Manual, Per Article)

Amazon's free browser extension lets you send any web page to your Kindle. Open a Substack post in your browser, click the extension, and it appears on your Kindle.

Pros: Free, made by Amazon, works with any web page.
Cons: Manual for every article, formatting can be inconsistent, desktop browser only.

### Method 3: Substack EPUB Download (Manual Download + Sideload)

Some Substack publications offer an EPUB download button on individual posts. Download the file, then email it to your Kindle's Send-to-Kindle address or transfer via USB.

Pros: Native EPUB from Substack, free.
Cons: Not available on all publications, manual for every post, must sideload.

### Method 4: Calibre (Desktop App, Full Control)

Calibre is a free, open-source e-book management app. Save Substack emails or web pages, import them into Calibre, convert to EPUB, and send to your Kindle.

Pros: Free and open source, full control over formatting, supports batch processing.
Cons: Requires a desktop computer, multi-step manual process, steep learning curve.

### Method 5: Substack App (Phone/Tablet Only)

Substack's official mobile app lets you read on your phone or tablet. There is no Substack app for Kindle.

Pros: Official Substack experience, push notifications.
Cons: No Kindle support, phone/tablet screen not e-ink.

### Substack on Kindle FAQ

**Q: Can you read Substack on Kindle?**
A: Yes. While Substack doesn't have a native Kindle app, you can read Substack newsletters on your Kindle by converting them to EPUB. The easiest method is using readinbox — forward your Substack newsletters once, and every new issue is automatically converted to EPUB and delivered to your Kindle.

**Q: Does Substack have a Kindle app?**
A: No. Substack has iOS and Android apps, but there is no Substack app for Kindle. To read Substack on Kindle, you need to convert newsletters to EPUB or use a service like readinbox to deliver them automatically.

**Q: What is the best way to read Substack on Kindle?**
A: For fully automatic delivery, use readinbox. For occasional one-off articles, Amazon's Send to Kindle browser extension works. For power users who want full control, Calibre is a free desktop option.

**Q: Can I read Substack offline on Kindle?**
A: Yes. Once a Substack newsletter is delivered to your Kindle as an EPUB file, it is stored on the device and can be read offline.

---

## Contact

- Support: support@readinbox.io
- Legal: legal@readinbox.io
- Website: https://readinbox.io