About seven million fax machines are now operating in the U.S., and it's getting harder every day to do business without one. Even the smallest-volume builder is likely to have a fax machine these days. The fax is a genuinely useful tool, allowing quick, easy communication with suppliers and subs, clients and architects. So it's no wonder that many contractors are now using their fax machines to send contracts and other legal documents. The question, however, is whether such documents are enforceable under law. The courts have yet to rule on the issue. Legal trends indicate that they will eventually rule in favor of faxed contracts, but until they do, the prudent fax user should heed the following. Problems With Mailed Follow-Ups When faxing