Black fax to harass large institutions or government departments, to retaliate against the senders of junk faxes, or merely as simple pranks. The basic principle of a black fax can be extended to form a "black fax attack." In this case, one or more sheets are fed halfway through the sender's fax machine and taped end to end, forming an endless loop that cycles through the machine. Not only can solid black be used, but also images which will repeat endlessly on the receiver's machine until its toner runs out. The introduction of computer-based facsimile systems (combined with integrated document imaging solutions)
Internet fax to scan documents and send them as a fax. Some providers also offer the option to get a dedicated fax number and receive fax on this number. The Internet has enabled the development of several other methods of sending and receiving a fax. The more common method is an extension of computer-based faxing, and involves using a fax server/gateway to the Internet to convert documents between faxes and emails. The process is often referred to as "fax to mail" or "mail to fax". This technology offers the advantage of dispensing with the machine as well as the additional telephone line,