German phrase
An welche E-Mail-Adresse soll ich ~ senden?
Meaning
What email address should I send ___ to?
When to use it
It asks for a destination. This politely checks the correct address.
Example dialogue
An welche E-Mail-Adresse soll ich die Bewerbungsunterlagen senden?
What email address should I send the application documents to?
Bitte schicken Sie sie an das Bewerbungsbüro der Universität.
Please send them to the university's application office.