820.01 TEAS RF Filing Requirements
To be eligible for the reduced fee, the TEAS RF application must include an e-mail correspondence address and authorization for the USPTO to send correspondence to the applicant by e-mail. 37 C.F.R. §2.23(a).
If the application includes an e-mail address and an authorization for the USPTO to send correspondence by e-mail, no additional fee will be required if the e-mail address is amended to correct an inadvertent error in the address prior to correspondence from the Office being returned as undeliverable, as long as the amendment is filed through TEAS or entered by examiner’s amendment, or if the applicant changes the e-mail address via TEAS ( see TMEP §609.02(b)).