That means you have to register with Forbes.com using a valid email address.

FORBES: Tax Horror Stories Giveaway

Criminals love contact lists as they give them valid email addresses and someone who they can pretend to be - you.

BBC: Computer security words in a Scrabble game

Liberty Reserve is a company that allows users to apply for an account through the Internet by simply supplying a valid email address.

WSJ: Costa Rica: Digital currency site founder arrested

Users are then responsible for registering a single account with a valid email address, credit card details along with a billing address (alternatively, a valid Paypal ID).

FORBES: European Courts Rule In Favor Of Consumers Reselling Downloaded Games

That means you have to register with Forbes.com using a valid email address, allow me to DM you on Twitter or message you on Facebook (depending on how you choose to enter the contest).

FORBES: Congress Needs Some Advice in 2012

How many of us when reading an apparently valid link in an email would bother to check whether the link is actually valid or whether instead it takes you to a malicious site.

BBC: Viewpoint: How hackers exploit 'the seven deadly sins'

Kelly had received a confirmation email from the airline, suggesting the fare should be valid under the new rules.

CNN: Too good to be true: New York to Hong Kong for $43