Domain-in-the-Middle Attacks

"It's an easy attack. Register a domain that's like your target except for a typo. So it would be countrpane.com instead of counterpane.com, or mailcounterpane.com instead of mail.counterpane.com. Then, when someone mistypes an e-mail address to someone at that company and you receive it, just forward it on as if nothing happened."

fonte: Schneier on Security