In the Sent items area of Echo there is a menu option of Download messages:
From here you’ll be presented with a list of the files available (at this time you can download files going back 6 months).
Just click on Download to the entire month’s data as a csv or Excel file. If you’ve sent a lot of messages, it may take a little time to download depending on your internet connection.
You’ll be able to open it in most spreadsheet programs, and the file contains the following columns:
If you need older data or different columns please contact support with the exact details of your requirements.