Imports live under Settings → Workspace → Import.
This page covers subscriber imports. To bring across your existing release notes from another tool, see Importing release notes. Import subscribers from a file
Prepare your file
A .csv, .xls, or .xlsx file with no header row, and one email address per row. Nothing else: no name column, no extra fields.
Upload it
Go to Settings → Workspace → Import, choose CSV Subscriber Import, and upload the file.
Wait for the email
The import runs in the background. Onset emails you when it’s finished, so you don’t need to keep the tab open.
Only import addresses that opted in to hear from you. Importing a purchased or scraped list will hurt your deliverability and may violate anti-spam laws in your customers’ jurisdictions.
Assigning imported subscribers to a list
The CSV import doesn’t ask which list to use. Imported subscribers land in your workspace and can be organized afterwards from Audience → Subscribers.
If you need subscribers placed on a specific list at creation time, use the Subscribers API instead.
Other sources
Subscribers can also reach your workspace by subscribing on your public page, being added manually, or through the API. See Subscribers overview. 
