Long Substack essays are much easier to read on a Kindle than in an inbox or the Substack app: no notifications, no blue light, and you can highlight as you go. Every Kindle has its own email address for receiving documents, so all you need is a way to get each new post to that address.

Before you start: two Amazon settings

Whichever method you use, you'll need two things from your Amazon account. Both are under Manage Your Content and Devices → Preferences → Personal Document Settings:

Your Send to Kindle address. Each Kindle and Kindle app has one, ending in @kindle.com.
The Approved Personal Document E-mail List. Amazon ignores documents from any address not on this list. Add whichever address will be sending to your Kindle (your own email for method 1, your Serifize address for methods 2 and 3).

If you buy from Amazon outside the US, use your own store (amazon.co.uk, amazon.de, amazon.es and so on). See how to add an approved sender on every Amazon store.

Method 1: Forward an issue by hand (free)

Add your personal email address to your Approved Personal Document E-mail List.
Open a Substack email and forward it to your @kindle.com address.
Wait a few minutes, then sync your Kindle.

This costs nothing and is fine for the occasional post. The downsides: you have to do it for every issue, and Amazon converts the raw email, so you'll often get Substack's buttons, footers and tracking images along with the article. Images and layout don't always survive.

Method 2: Subscribe with a Serifize address (automatic)

This is the simplest automatic setup and the one we recommend for new subscriptions. Serifize gives you your own mailbox address. Anything sent to it is cleaned up, turned into a proper Kindle ebook with images and a cover, and delivered to your Kindle.

Sign up for Serifize and enter your @kindle.com address.
Add your Serifize address to Amazon's Approved Personal Document E-mail List.
On Substack, subscribe to the newsletter using your Serifize address instead of your personal email.

New posts now usually show up on your Kindle within a few minutes of being published, with the newsletter's name as the author.

For paid Substack subscriptions, the subscription is tied to the email you paid with. Keep it on your personal address and use method 3 to forward a copy.

Method 3: Keep your inbox, forward a copy automatically

If you'd rather keep receiving newsletters in Gmail, or you already have paid subscriptions, set up a Gmail filter that forwards a copy of every Substack email to your Serifize address:

In Gmail, add your Serifize address as a forwarding address. Serifize confirms Gmail's verification email for you automatically.
Create a filter for emails from substack.com (or a specific newsletter) and choose Forward it to your Serifize address.
Each new issue lands in Gmail as usual, and a copy goes to your Kindle.

The step-by-step walkthrough is in how to auto-forward newsletters from Gmail to Kindle.

What about other newsletter platforms?

Everything above works the same way for Beehiiv, Ghost, Kit (ConvertKit), Buttondown, Mailchimp and any other newsletter that arrives by email. Serifize doesn't care where an email comes from, only that it reaches your mailbox.

Troubleshooting

Nothing arrives on my Kindle

By far the most common cause: the sending address isn't on your Approved Personal Document E-mail List, or it's on the list for a different Amazon store than the one your Kindle is registered to. Amazon drops these documents without telling anyone.

It arrives in my Kindle library but not on my device

Make sure the @kindle.com address you entered belongs to the device you read on. Each Kindle and Kindle app has its own address, and a new or replaced Kindle gets a new one.

How much does it cost?

Serifize is free for 3 newsletters a month. Unlimited is $4 a month, or $36 a year. See how that compares to other newsletter-to-Kindle services.

How to read Substack on your Kindle