304.06 Outgoing Electronic Mail
The USPTO will not send e-mail to an applicant or registrant unless the applicant or registrant authorizes the USPTO to do so. TMEP §304.03.
When authorized to communicate by e-mail, the USPTO may send Office actions and other official correspondence to the Internet e-mail address designated by the applicant or registrant. The USPTO will not send correspondence to more than one e-mail address. See TMEP §304.08 regarding addresses for e-mail correspondence directed to the USPTO.
If outgoing electronic mail is returned as undeliverable, the USPTO will mail a paper copy to the correspondence address of record.The USPTO is not required to send Office actions and other official correspondence by e-mail whenever the applicant or registrant authorizes e-mail correspondence. The USPTO may send correspondence by e-mail, regular mail, fax, or other appropriate means.