Well I reply to emails in several languages so that's a tough question!
In Portuguese:
Atentamente (attentively I guess it translates)
or
Com os meus melhores cumprimentos (with my best regards)
or
grata pela sua atenção, subscrevo-me com os meus melhores cumprimentos
(grateful in advance for your attention I undersign with my best regards)
In Spanish:
Atentos Saludos (attentive salutations lol!)
or
un cordial saludo (cordial salutations)
In French:
Merci à l'avance (thank you in advance)
or
Avec mes meilleurs complients (with my best regards)
or
Amicalement (with friendship)
In English:
Best Regards
or
Kind Regards
or
Best Wishes
or
Thank you
And then my name!
My favourite reply in this post, because it made me laugh, is analog's "not wearing any pants"!