An Anti -Doping Organization is encouraged also to supplement this basic provision with other notice and/or “deemed notice” provisions in its rules (for example, permitting use of fax, email, SMS text, approved social networking sites or applications or other methods of service of notice; permitting proof of actual receipt as a substitute for deemed receipt; permitting notice to be served on the Athlete’s National Federation if it is returned undelivered from the address supplied by the Athlete).