Does the customer any risks if I don't use corporate mail when you log into AppleID?
You correctly responded above, copyright and email address (in your case it is your personal data) are legally unrelated. The presence of the email does not indicate authorship, does not provide rights to a work, this is the contact information of the person who posted the app in appstor...
To publish an application such as a Trustee (power of attorney), putting your contact information and it will not mean that the Trustee is the author of... and the same is true for the employee performing the service instructions of the employer, but the worker must act on behalf of the employer and specify the working contact information, otherwise, in the event of disagreement the employer and the employee the latter may be difficult to prove that he had acted precisely within the framework of duty, and not in their personal interests.
Risks can arise for you as you not being the author of published foreign application from your personal account... you have the right to publish?