If you think you're seeing more unsolicited commercial e-mail, jokes, and chain letters, you're right, researchers say. According to experts, in 2002 spam grew to encompass an astonishing 30% to 50% of all e-mail sent. DEFINITION: Spam is unsolicited e-mail. While senders tend to view spam as a form of bulk mail, consumers view it as simple junk e-mail. Spam is similar to unsolicited telephone marketing calls; however, recipients pay for part of the message, because everyone shares the cost of maintaining the Internet. By some estimates, the global cost of spam is $11 billion a year worldwide. While perhaps not as big a threat as computer-borne viruses, spam is a daily productivity drain on corporate America. Here, according to anti-spam company Brightmail, are the 10 most frequently-sent spam messages of 2002: Rank Subject Line 1 "Protect Your Computer Against Viruses for 9.95" Description: Ironic! Anti-virus software ad 2 "Verification Department" Description: Credit-card scam 3 "Refinancing? Get a FREE quote on any mortgage loan program" Description: Mortgage spam, a classic 4 "Printer Cartridges -- Save up to 80% - Free Shipping Offer" Description: Another classic, always a hit 5 "Miniature Remote Control Car. Great Gift!" Description: This one was big during the holidays 6 "$100 FREE, Please Play Now!" Description: Casino spam, a high-roller 7 "Online Auction Marketing Secrets!" Description: Auction scams were big in 2002 8 "Important News Kuira" Description: Septic system spam -- a real stinker 9 "URGENT & CONFIDENTIAL" Description: Nigerian spam scam just won't die 10 "THOUSANDS OF XXX SITES!" Description: Porn, an eternal favorite © National Security Institute, Inc.