E-mail etiquette is an art in itself, yet the most socially intrusive, and therefore potentially dangerous, modern gadget is, unsurprisingly, the ubiquitous mobile telephone.

When John Debrett founded his eponymous toffs' "Bible" in 1769, he didn't have to contend with such modern delights as the e-mail, text message and video-conference.

Yet if the legendary expert in Georgian manners had been born 250 years later, you get the feeling that he'd have used digital technology in the nicest possible fashion.

Business e-mail signatures should supply relevant information, such as job title, company website address, telephone and e-mail address. Any sarcasm or subtle humour must be tempered, especially in messages sent between those who are less well-acquainted.

Salutation And Sign-Off Suggested informal salutation: name only (ie, "Jon").

It’s also used for oneself if you want to be a smart-alec (meaning something like ‘my honourable self’).

-kun is typically used for people talking to someone of a lower rank than them, or a man the speaker is emotionally attached to.

For outsiders looking in at a country’s etiquette rules, it can be easy to get culture shock.

That’s especially true when, like Japan, the country is famous for the complexity of its social rules.

A few words suffice as a holding reply (and reassure the sender that the e-mail has been received) until a longer reply can be composed. Refrain From Sarcasm Unlike an interactive telephonic or face-to-face conversation, it is impossible to judge how the recipient will interpret any comments in an e-mail.

Include Your Contact Details It is common to have a choice of several professional and informal signatures. The writing should therefore be kept brief, simple and to the point.

In both "E-tiquette" and etiquette, she adds: "The number-one rule is to treat others as you would like to be treated." Correct Form is published by Debrett's, priced £17.99 Think Before You Use The 'BCC' Field "Blind carbon copy", or "bcc", should seldom be used; it is deceptive to the primary recipient.

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