blast fax
n. A fax that is sent to a large number of recipients.

Example Citations:
Many Senate aides said their offices are counting input only from home-state constituents. Senate aides said that in recent years, they have been flooded with “blast faxes” and e-mail “spam lists,” both of which can send countless messages to senators with the push of a computer button.
—Michael Kranish, “Corporate America holds off on lobbying,” The Boston Globe, January 21, 1999

Faxes were OK when they came into a machine and somebody handed you pieces of paper, but now fast faxes, blast faxes, attack faxes and so forth come pouring into my PC, where they go into a fax program that is cumbersome and unreadable.
—Dale McFeatters, “Out of touch,” Journal of Commerce, May 21, 1999

Earliest Citation:
One goal at the convention was to encourage a grass roots lobbying organization among Florida bankers. The trade group uses what it calls a “blast fax,” which it sends to bankers statewide when the association wants them to call legislators on a specific issue. A script often accompanies the fax to help bankers appear up on the issue.
—Robert Trigaux, “Bankers told to assert themselves politically,” St. Petersburg Timew (Florida), June 22, 1992

Notes:
Gareth Branwyn, head honcho of Wired's Jargon Watch column, alerted me to this phrase. -Paul

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