As the message says, you have IP issues!
You should fill out a form saying you are the creator of the design. Make sure you don't have any logos or other IP issues in your design that are owned by another company.
Also, we can't see your file. This is a user-to-user platform.
It might be the logo - even if it is made up, the reviewers don't know that. So you need to fill a property release form which you can download from Adobe.
I would say, it's mail.com. that's a real address, even if you thought to use a generic address.
Unrelated: check your English. "why chooes us" is not correct! 😉
Re-read the Stock Contributor User Guide carefully.
Were you invited by Stock to contribute Design templates?
Note: Design templates are not currently accepted through the Contributor portal. For now, our collection of design templates is by invitation-only and represents a relatively small group of artists and agencies. Over time, we may be expanding them to include a broader group of contributors.