The other day I opened my email inbox and found an intriguing message from the International Monetary Fund (IMF).

FORBES: "Are Your truly dead?" The IMF, Watson and Schrodinger's Cat.

Bloomberg reported that one executive - deputy president of Coca-Cola's Pacific Group, Paul Etchells - opened an email he thought was from the company's chief executive.

BBC: The Comment Group: The hackers hunting for clues about you

They are thus likely to stand out from the usual email chatter and get opened.

FORBES: Three Ways to Get Your Email Answered First