What does' improper submission 'mean?

Not delivered properly "refers to the situation where the delivery staff have already delivered the email, but due to the recipient's absence or other reasons, the email was not delivered properly to the recipient, and the package was not signed for, indicating that it was not delivered properly.
The package is delivered overseas by a local delivery service provider. In order for you to retrieve the package in a timely manner, we suggest that you proactively contact the delivery company to inquire about the delivery status of the package. At the same time, you can also provide feedback on relevant issues to our customer service, and we will urge the delivery company to resolve your package delivery issue as soon as possible.
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