819.01(e) E-mail Address 
The application must include the applicant's e-mail address and the e-mail address for the applicant’s qualified U.S. attorney, if one is appointed in the application. 37 C.F.R. §§2.21(a)(1), 2.22(b), 2.23(b). See TMEP §803.05(b) for more information about the e-mail address that may be listed for the applicant.
No additional fee will be required if the e-mail address is amended to correct an inadvertent error.