!!! Overview
[{$pagename}] is a term that refers to several methods by which individuals can avoid receiving unsolicited product or service information. 


[{$pagename}] ability is usually associated with direct marketing campaigns such as, e-mail marketing, or direct mail.

[{$pagename}] list of those who have opted out is often called a Robinson list.

*  National Do Not Call Registry
* [Do Not Track] ([DNT])


!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Opt-out|Wikipedia:Opt-out|target='_blank'] - based on information obtained 2018-09-08-