Send to Kindle Error E999 and the Other Error Codes, Explained
When a document you emailed cannot be delivered, Amazon replies with an error code. E999 is the vaguest of them: Amazon describes it as a Send to Kindle internal error and advises trying again later. The other codes are more specific, and each points to a fix. The steps below start with E999 and then cover the codes you are most likely to see.
Step-by-Step Guide
Step 1: E999: wait and send it again
Amazon lists E999 as Send to Kindle Internal Error, meaning the service had a problem, and says to retry later. Send the same email again after a while. It often goes through without any change to the file.
Step 2: If E999 keeps coming back, try another route or a simpler file
Upload the same file through Send to Kindle for Web. If that fails too, the file itself may be the trigger: export it again, or convert it to a clean EPUB, and resend.
Step 3: E014: approve the sender
E014 is Unapproved Sender Email Address. Add the address you are sending from to your Approved Personal Document Email List, under Preferences and Personal Document Settings in Manage Your Content and Devices, then send again.
Step 4: E001, E004 and E005: fix the file
E001 means the file format is not supported, E004 means the file is password protected, and E005 means a PDF is encrypted or damaged. Convert the file to a supported format such as EPUB or PDF, remove any password, and check that it opens normally before resending.
Step 5: E006, E007 and E009: fix the email
E006 means too many attachments, E007 means the attachments are too large, and E009 means the email had no attachment. Keep to 25 attachments and 50 MB in total, and make sure the file is actually attached.
Pro Tips
- 💡 E013 and E016 are not failures: the document was delivered, but in a simpler or fixed layout
- 💡 E010 to E012 are warnings about sending too much; slow down if you see them
- 💡 The error email goes to the address you sent from, so check that mailbox and its spam folder
- 💡 Keep the error email until the document arrives, since the code is the fastest way to a fix
Frequently Asked Questions
What does Send to Kindle error E999 mean?
Amazon lists it as Send to Kindle Internal Error: the service itself had a problem. Amazon's advice is to retry later.
Is something wrong with my file if I get E999?
Not necessarily. E999 is Amazon's code for an error on its side, and the same file frequently delivers on a later attempt. If it fails repeatedly, try a freshly exported or converted copy.
What does error E016 mean?
Amazon describes E016 as a file delivered in its original layout instead of a reflowable format. The document did arrive, but text may not resize. Amazon suggests removing elements such as large tables, multimedia, equations and footnotes if you want a reflowable version.
How can I avoid these errors for newsletters?
If the documents you are sending are email newsletters, InboxToKindle removes most of this work: you approve one sender once, and every newsletter you subscribe to is converted to EPUB, stripped of tracking pixels and delivered for you. The free plan includes 3 deliveries a month and Pro is unlimited for $10 a month.