The trademark electronic filing system's Change Address or Representation form can be used to change the primary email address for correspondence in more than one application or registration by changing the attorney email address, if represented, or the owner email address, if unrepresented. An applicant, registrant, or qualified U.S. attorney may submit up to 300 application serial numbers or registration numbers at one time. Requests to change the address for more than 300 applications/registrations should not be submitted in a single form.