What changed on 1 April 2025, and why your sending address is yours
Amazon's approved-sender list, the day domain wildcards stopped working, and why every account here has its own permanent address.
· RoutineInk
Amazon will not accept a document for your Kindle unless the address it came from is on a list only you can edit. This is the single step that decides whether any send-to-Kindle service works, and it is the step most of them explain badly. Here is what the list is, what changed in 2025, and why it shapes how RoutineInk is built.
What the list is
Every Amazon account has an Approved Personal Document E-mail List: a set of sender addresses
allowed to mail documents to your @kindle.com address. Mail from anywhere else is refused. It
exists so that knowing someone's Kindle address does not let you put files on their device — a reasonable
rule that happens to be the main source of confusion in this category.
u4f9kqr@send.routineink.com Add address The 1 April 2025 change, and why it matters
Until then you could add a whole domain — @somekindleservice.com — and every address at that
service was covered. On 1 April 2025 Amazon started matching the full address. Wildcard
entries stopped working, and services that had relied on them stopped delivering, in some cases for days
before anyone worked out why.
The consequence for you is small but non-negotiable: the address you approve has to be your address, character for character. The consequence for us is the architecture — every RoutineInk account gets its own permanent sending address on a dedicated subdomain, and it never changes for the life of the account.
Why yours and not ours
A per-account address is the only design that survives the rule: there is no shared sender for Amazon to
match against, so there is nothing for a policy change to break across every customer at once. It also makes
the address something to copy rather than something to know. Yours looks like this, but the
letters after the u are yours alone:
Seven characters after the u, from an alphabet with no i, l, o, 0 or 1 — because this gets read aloud and typed by hand.
Then we test it
RoutineInk sends a one-page test document to a new Kindle before anything real, and waits to hear that it arrived. If the approval is missing, Amazon mails a refusal back to the sending address — which is on our domain, so we receive it, read it and tell you precisely what to fix. That loop is the difference between finding out in the first minute and finding out in a fortnight when you notice you have not read anything.
If it still refuses
- Check the account. The approved list is per Amazon account. If you have a personal and a work account, the Kindle is registered to exactly one of them.
- Check for a stray space. Pasting from a chat app often brings a trailing space or a zero-width character with it. Use the copy button in the dashboard.
- Check the destination address too. A typo in the
@kindle.comaddress produces a different refusal — "no such address" rather than "not approved" — and RoutineInk tells the two apart for you. - Give it a minute. Amazon's approval list is not instant. If you approve and send in the same breath, one retry usually settles it.
The short version, with pictures: approve our address on Amazon →
Amazon, Kindle, Kindle Scribe and Send to Kindle are trademarks of Amazon.com, Inc. or its affiliates. RoutineInk is not affiliated with Amazon.