the email you use as username is not seen by anyone.
it is something between your screen, the database for checking and your eyes to see.
If you are spamming it will not come from PS since it is not the purpose of using an email to spam you.
The email won\'t be sold.
So if you are spammed, it will be by yourself

If you share the computer with other people, ask the client not to remember your user name.