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There's actually a mailing list to discuss tpc.int. The locations to which faxes may be sent are limited, and there are no service guarantees. Furthermore, your fax is delivered with a full-page cover sheet, which briefly describes tpc.int and may contain advertising to help defray some of the marginal costs. The service is free, and no one makes any money doing it. It's not appropriate for sending faxes that are time-sensitive.