Troubleshooting
Send to Kindle Not Working? The Complete Troubleshooting Guide
It usually isn't your internet connection. Here's every common reason a document you emailed never shows up on your Kindle - checked in the order most likely to be the actual cause.
July 17, 2026 · 8 min read
Amazon's Send to Kindle is a genuinely useful feature: email a document to your device's @kindle.com address and it shows up on your e-reader. When it works, it's invisible. When it doesn't, it's one of the more frustrating silences in consumer tech - no error message, no bounce, nothing in your inbox to explain why the file never arrived.
The good news is that almost every failure traces back to one of a handful of causes, and most of them take under a minute to fix. Work through this list in order - the first two account for the large majority of reports.
Cause #1
Your sender address isn't approved
This is the single most common reason a document silently disappears. Amazon only accepts Personal Documents from email addresses you've explicitly approved on your account - anything else is dropped with no notification, not even a bounce-back email. If you switched email accounts, sent from a work address instead of personal, or are using a new tool for the first time, this is almost certainly it.
- 1
Open Manage Your Content and Devices
Sign in at Amazon and go to Preferences > Personal Document Settings.
- 2
Find "Approved Personal Document E-mail List"
This is a separate list from your regular Amazon account email - it controls who's allowed to send you documents.
- 3
Add the exact sending address
Add the precise address the document is coming from. A typo or an extra alias (e.g. a "+label" variant) will still get silently rejected.
- 4
Resend the document
Delivery is usually near-instant once the sender is approved - if it doesn't appear within a few minutes, move to the next cause below.
Cause #2
Wrong Kindle email address
Every Kindle has its own unique @kindle.com address, found under Manage Your Content and Devices > Devices > [your device] > Device E-mail. It's easy to copy this once, save it somewhere, and not notice when it's stale - for instance if you got a replacement device or added a new one and kept using the old address by habit. Double-check it character by character; these addresses are randomly generated and easy to mistype.
Cause #3
Unsupported file format
Send to Kindle supports PDF, DOC/DOCX, TXT, RTF, HTML, common image formats, and EPUB. MOBI conversion support has been phased out, so an old .mobi file is one of the more common silent failures for people with older ebook libraries - re-export or convert it to EPUB first.
If you're sending a PDF and want it to reflow like a normal book instead of staying a fixed-layout image, put the word Convert in the email subject line. Skip that and Amazon delivers the PDF exactly as-is, page images and all - see our full guide to sending PDFs to Kindle for more on getting this right.
Cause #4
File is too large
Documents sent by email are capped at 50MB. Image-heavy PDFs and large scanned files are the usual culprits - try compressing the PDF or splitting it into smaller sections. If you're sending ebooks regularly, EPUB files are far less likely to hit this ceiling since they're reflowable text rather than fixed page images; see our EPUB to Kindle guide.
Cause #5
Device or account mismatches
A few less common but real causes, roughly in order of how often they come up:
- Storage is full. A Kindle that's out of space can fail to save a new delivery without any obvious warning on the device itself.
- The device hasn't synced. Older Kindles need an active WiFi connection specifically at delivery time - being "connected" earlier in the day isn't enough if it's since gone to sleep. Wake it and let it sit on WiFi for a minute.
- Wrong Amazon account. Each Kindle is registered to one Amazon account, and documents route based on which account's approved-sender list matches. If you have more than one Amazon account (common for households or people who mix personal/work purchases), check the device is registered to the account you think it is.
If none of this fixes it
At that point it's worth ruling out your email provider rather than Amazon - some corporate and school email systems quietly filter outbound mail to unfamiliar domains, including @kindle.com. Try sending from a personal Gmail or similar account as a test.
A simpler fix
Skip re-checking settings every time
Most of the causes above share a root problem: Send to Kindle asks you to remember two separate pieces of account configuration - your exact device address and your approved-sender list - and get both right, every time, from whichever email client you happen to be using. Kindlesuite collapses that down to a one-time setup. You save your Kindle address once and approve a single sender, and every future upload - PDF, EPUB, article, whatever - goes out through that same pre-approved channel instead of you re-verifying settings each time.
Never debug Send to Kindle again
Save your Kindle email once. Every file after that is a single upload through the same official delivery pipeline.
FAQ
Common questions
Why did my Send to Kindle email not arrive at all, with no error?
What file formats does Send to Kindle actually support?
How do I get a PDF to reflow instead of staying a fixed image?
Is there a file size limit for Send to Kindle?
My Kindle is connected to WiFi but still isn't getting documents. What else could it be?
Is there a way to avoid the approved-sender step every time?
Stop fighting your Kindle inbox.
Upload once, and Kindlesuite handles the delivery - no re-checking approved senders or hunting for your device email.