German phrase
Wie ist die E-Mail-Adresse von ~?
Meaning
What is ___'s email address?
When to use it
It asks for an email address. This direct question suits people, companies, and groups.
Example dialogue
Wie ist die E-Mail-Adresse von der Firma?
What is the company's email address?
Die findet man auf der Webseite.
You can find it on the website.