Every day, most businesses receive unsolicited and unwanted fax messages advertising penny stocks, vacations and other supposed and sometimes imaginary services. Most of these are violations of the Telephone Consumer Protection Act of 1991 and of FCC rules that explicitly prohibit junk faxes.Up to the end of 2004, senders can use a pre-existing business relationship to justify using your fax line, paper and toner. Starting Jan. 1, 2005, the FCC says advertisers require \u201ca signed, written statement that includes the fax number to which any advertisements may be sent.\u201dMany junk faxes lack any information about the company sending the advertisement other than a toll-free number. There\u2019s no name, no address, no corporate phone number and no return fax number. Some are even more obviously fraudulent than others; for example, the fax that sparked today\u2019s article had no sender information in the header (a violation of FCC rules) and claimed to be from \u201cOur Corporate Travel Department.\u201d How could anyone be gullible enough to do business with such obviously dishonest people?Using the phone number indicated for removal of one\u2019s fax number from a junk faxer\u2019s list may not work; some commentators suggest that, much like \u201cremoval\u201d addresses on some junk e-mail messages, these phone numbers may actually be a means to confirm fax numbers for further use.Slashdot has an extensive discussion of responding to junk fax that started May 10:https:\/\/tinyurl.com\/2ktm6Correspondents offered several ideas for responding to junk faxes - some of them good and some not so good.On the positive side, several people commented that using a physical fax machine should be restricted to outbound calls where it is easier and quicker to scan and send physical paper all at once than to use a scanner and a computer-fax program. For reception, one can install an old, out-of-date computer on the inbound fax line and record all faxes to disk. A quick look at the faxes can allow someone (say, a secretary) to discard junk faxes. In addition, the electronic images can be sent to recipients (even lists of recipients) through e-mail as attachments instead of having to print them to paper.On the less-good side, several people suggested vigilante retaliation against the faxer. Several people suggested taping the ends of paper together in the fax machine to generate an enormous output fax; however, others pointed out that the junk faxers are likely using computers for their inbound faxes too, so it won\u2019t cost them anything in resources.Other correspondents suggested programming a modem or fax machine to call the listed toll-free numbers repeatedly to rack up large phone bills for the junk-fax sender. However, using the phone lines for harassment may violate federal and state laws and potentially lead to prosecution of the vigilante.In addition, someone identified as \u201cBasharTeg\u201d posted an interesting riposte May 11 suggesting that the phone-bombing may target the wrong people. He explained that he works for a provider of toll-free numbers. Junk faxers typically run their scams quickly and then disappear without paying the phone-number supplier for the calls. Therefore, bombarding the toll-free numbers simply generates costs for the innocent phone-service providers rather than punishing the junk faxers. In addition, the calls typically cost only pennies per minute. Given the economics of this kind of scam, it would take thousands of calls to generate a significant bill even if the criminals were actually paying it.Theoretically, if one can find out exactly who is sending a junk fax, it is possible to sue the sender in civil court. Damages can reach $1,500 per violation. However, few recipients are going to go to the trouble of (a) tracking down the malefactor, (b) spending time in small-claims court, and (c) trying to collect from such people even if they win.Some people have become so angry about junk faxes that they have organized resistance. For example, Venture Capital Management of Peoria, Ariz., has an entire Web site devoted to providing information about junk faxes and how to fight the senders:http:\/\/www.faxcapital.comAt least one law firm is providing services to collect junk faxes, sue the senders, and share the proceeds with the original victims: Demirali Law Firm of Denver, Colo.:https:\/\/www.faxwars.com\/turning.htmVictims send faxes in batches of 10 along with a downloaded form. If the lawsuits succeed, the firm pays the original victim $25 per junk fax or the proportion based on the theoretical maximum.In any case, at the very least, readers should ensure that all junk faxes received on corporate machines be destroyed immediately. I would add appropriate policies to the corporate information security policies to ensure such protection of all employees against fraudulent offers received by junk fax. It would also be helpful to include a note in the corporate newsletter reminding employees of the danger of responding to such drivel.