47 CFR § 1.5 - Mailing address furnished by licensee.
(a) Each licensee shall furnish the Commission with an address to be used by the Commission in serving documents or directing correspondence to that licensee. Unless any licensee advises the Commission to the contrary, the address contained in the licensee's most recent application will be used by the Commission for purposes of this paragraph (a). For licensees in the Wireless Radio Services, each licensee shall also furnish the Commission with an email address to be used by Commission for serving documents or directing correspondence to that licensee; correspondence sent to such email address is deemed to have been served on the licensee.
(b) The licensee is responsible for making any arrangements which may be necessary in his particular circumstances to assure that Commission documents or correspondence delivered to this address will promptly reach him or some person authorized by him to act in his behalf.