A number of Barclays traders have seen some unwise emails come back to haunt them. The Leveson Inquiry too has shown how embarrassing, and potentially dangerous, unguarded comments in emails can be.

So, are people increasingly more cautious about using email?

Author of Brilliant Email, Dr Monica Seeley admitted that "we have not learnt anything about how to deal with emails in the last ten years", and called for an etiquette policy which takes the law into consideration.

Editor of Management Today, Matthew Gwyther, said that "the problem with emails are that they are seductive" and conversational. He added that "people forget that this conversation will still be sitting in a server in India for the next ten years."

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