Yes, junk faxes are a big problem. Check these links for some ideas or search on the web using "junk fax" for other tips.

http://www.junkfaxes.org/

http://www.junkfax.org/

http://www.junkbusters.com/fax.html

http://www.ci.beaverton.or.us/departments/recycling/recycling_junkfaxes.html

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