Create a new contact for anyone who emails into your marketing alias and doesn’t exist in your database when you set up a create sender contacts skill, Drift Email will make a new contact in your database for anyone who emails into your marketing alias and doesn't already exist in your database.
To get started, click the "Skills" item in the navigation bar, then click "Create skill," and then click "Create sender contacts."

From there, you'll be able to name your skill, select your email types, add filters, and choose how you would like to sync the new sender contacts from the emails you specified. For complete details in all of these steps, check out our help doc here.
Once you've completed this step, you're all set and should start seeing the benefits of all that Drift Email can do for you.