IMHO, not a good idea. I'm Spanish speaker, and I could write my mails in English and Spanish.
But the people I'm discussing with, are from many different countries and languages. If the person who answer me is German, and he writes his reply in English and German, you have that Spanish speaking people who was following my mail, can't read not the English nor the German. So, let's keep using English as common language. Cheers! tavillo1980
