17 CFR § 248.126 - Delivery of opt out notices.
(a) In general. The opt out notice must be provided so that each consumer can reasonably be expected to receive actual notice. For opt out notices provided electronically, the notice may be provided in compliance with either the electronic disclosure provisions in this subpart or the provisions in section 101 of the Electronic Signatures in Global and National Commerce Act, 15 U.S.C. 7001, et seq.
(1) Hand-delivers a printed copy of the notice to the consumer;
(2) Mails a printed copy of the notice to the last known mailing address of the consumer;
(1) Only posts the notice on a sign in a branch or office or generally publishes the notice in a newspaper;
(3) Posts the notice on an Internet Web site without requiring the consumer to acknowledge receipt of the notice.