Lucy Kellaway answers the questions of FT-readers
The first problem came from trying to sound warm. "Take care" and "Warmest regards" ooze insincerity, though are better than "Warmly", which is soppy and leaves me feeling distinctly chilly.
The next failed attempt at friendliness involves striking a matey note. "Cheers" and "Catch you later" sound more sloppy than soppy - and dim, too.
Sloppy, dim and grating
Worse than mateyness is cheeriness - usually signalled by an exclamation mark, which should have no place in e-mails, especially not at the end. "Have a good one!"; "All the best!"; "Enjoy the weekend!" are sloppy, dim and grating.
Less dim, but no less misguided, are abbreviations. These achieve some informality, but at the cost of being insulting by implying that the writer can't be bothered to make a couple of additional keystrokes. "BR", which is distressingly popular, still means British Rail to me. "Rgds" is hideous, and "HTH" (hope that helps) does not help at all. One reader has written in recommending you sign off "Yrs Ev". I wish I could be confident he was joking.
E-Mails are not written to friends
The two most popular "friendly" e-mail sign-offs are "Thanks" and "Best". The first is acceptable if there is something to be thankful for, but in most e-mails this is not the case. And the second is never all right as it makes one wonder: best what?