Summary
The French translation for “What is your e-mail address? (formal)” is Quelle est votre adresse email?. The French, Quelle est votre adresse email?, can be broken down into 5 parts:"which; what (feminine singular)" (quelle), "is (3rd person singular)" (est), "your (formal singular)" (votre), "address" (adresse) and "e-mail" (email).