Fax Broadcasting refers to sending out a large quantity of faxes, usually faxing the same document to a large list of recipients. The document may include variable fields to address each recipient by name and company.
It is possible to use an internet faxing service for fax broadcasting, however, this may become unwieldly for lists of over 1,000 recipients. In such cases you might be interested in handing the job over to an outsourced service.
www.broadcast-fax.info is a site where you can find a review of fax broadcast services. They also offer a frequently updated section of fax broadcast news. Another good place to look is Yahoo's Fax Broadcasting section and also Google Directory.