It is a locution that names the channels to inform them to transmit news, such as a local gossip. Although in many cases it is promoted by official channels that prefer alternative methods to download information without committing, it is always noted that the 'witch mail' is clandestine or at least unofficial. For this reason it is also a way to call smuggling, illegal mailing or the transfer of goods between countries by taking advantage of grey areas in legislation. View aisle radio, and other versions like witch mail, witch mail.
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