The word Email is the same in every language.
Officially, the Académie Française recommends the word for email be "mél" for me ssage él ectronique (lit. Electronic message). In practice everybody says mail or email, but the official word is voluntarly chosen to not be the English word, as the Académie often does.
A computer is called "Ordinateur", Bytes are called "Octets" (and prefixed with the usual kO, MO, ... IIRC). Bits are surprisingly called Bits