What file types can be imported to create subscriber lists in Express Email Marketing?
Using Express Email Marketing® you can import customer mailing lists from any CSV or text file. If your customer database is in Microsoft©, Excel, Outlook, or any other CRM or personal organization tool, you should use the Save As or Export options to create a CSV or TXT file.
Upload the database, and then edit the imported file into a format that matches your sign-up form.
For more information, see Importing Existing Customer Lists in Express Email Marketing.