We encourage you to check Manage Orders in your seller account regularly to ensure that you are aware of all incoming orders. Do not rely on the Sold, Ship Now email notification alone to identify shippable orders. You can also check for shippable orders using the Unshipped Orders report.
You should only ship orders that you can verify in Manage Orders. All orders listed as Unshipped in your seller account can and should be shipped promptly in accordance with Amazon policies.
Here are some causes and possible solutions for why you may not be receiving your Sold, Ship Now email notifications:
The connection between the Amazon mail server and your mail server timed out, or your Internet service provider (ISP) was temporarily unable to receive messages.
Your email address is incorrect or your inbox was full.
Your email service identified the message as spam or junk.