A major U.S. internet company has filed an anti-spam lawsuit against a Kitchener man and his two sons, in what they are calling the "single greatest disruption" to their e-mail network.

In the suit filed Wednesday, the Yahoo Internet company alleged that more than 94 million pieces of junk e-mail, or spam, were sent out by Barry Head and his sons, Eric and Matthew since January.

Yahoo claimed the trio used various techniques to thwart their spam filtering technology.

The three men are among hundreds named in civil lawsuits aimed at curbing the proliferation of unsolicited e-mails.

Microsoft Corp., America Online Inc. and Earthlink Inc., along with Yahoo, filed the suits in U.S. federal courts located in four states.

The companies said the lawsuits named some of North America's major spammers.