Do the User Id properties of email aliases remain the same in Google Apps / App Engine?

It's possible to have nicknames / aliases for your email accounts i开发者_Python百科n Google Apps - so if I have email ID a1@domain.com with nicknames a2 and a3, will the user_id property on App Engine differ when I use these different aliases to login?

You can't log in with an email alias unless you create a Google account for them, in which case they will appear as their own separate account, indistinguishable from any other.