G Suite provides a feature to create Directory with the details of users in the domain.



You have just have to Enable Contact Sharing option from your Admin Console and you are ready with a directory of all employees with their Email addresses.



Go through the following steps to Enable Contact Sharing.



Step 1: Log in to your Admin Console and go to G Suite.



Step 2: Select Contacts and go to sharing settings.



Step 3: There you can declare settings as needed.



Click here for more details