Amazon has discontinued the Send to Kindle feature. Regrettably, they have not made an alternative process available that we can provide to you through oreilly.com. If you valued this feature you can contact Amazon and request that they either re-enable it or create an API-based solution for publishers to implement.
There are two other ways to read ebooks purchased through oreilly.com on your Kindle:
1. Download the .mobi file to your computer, plug your Kindle into your computer, and drag the .mobi file to the Kindle folder.
2. Download Amazon's Send to Kindle App and follow the instructions.
For additional assistance, please contact O'Reilly Customer Service at firstname.lastname@example.org or +1.707.827.7000 / 800.998.9938.