[header] How to stop unwanted faxes [title] Call the sender and opt out from their list. [step] In the united states, the 2005 junk fax prevention act requires all fax marketers to provide a way for receivers to opt out of future faxes. Usually they will provide an opt-out telephone number, but sometimes they will provide a fax number, a website or an email address. 
[substeps] In some cases, calling an opt-out number will not work. This typically occurs when the fax marketers are deliberately breaking or ignoring the law.