'With kind regards' or 'Kind regards'?

Hi,

As a Dutch national in an international working environment I regularly need to write business e-mails in English. I am doubting whether 'with kind regards' or 'kind regards' is the proper closing for an e-mail. My Dutch collegues tend to say 'with kind regards' but I am not sure if that is not too 'Dutch-English'.
I know that it is too informal usually for formal letters, in that case I use 'yours sincerely'.

I appreciate any help from you!

Thanks! Silvie.

Thank you very much for your help!

According to my "Handbook of Commercial Correspondence" by A.Ashley (second edition 1992, first 1984) you should captalize it:

Yours sincerly,
[Signature]

or, if the receipient not known by name ("Dear-Sir-or-Madam" letters),

Yours faithfully,
[Signature]

Note: The book is seemingly written for British-style correspondence. American style correspondence might differ from it.

Hi,

In Canada, I usually see 'Yours sincerely'. Or variations like 'Sincerely yours' or 'Sincerely'.

I seldom see 'Yours faithfully'.

I never see 'Yours truly'.

Best wishes, Clive