This report will list all Customers in your Blackpurl
From the Blackpurl Header > Reporting > Report - Customers
The default columns and parameters is as per this screen shot:
You can change your parameters are any time by clicking on 
or click on 
to select and/or deselect further columns
This would be a great report to run and then export to csv for a email push or letter drop etc by simply changing the columns to what you need to seen and then export the file.
For further tips on reporting, please click on this link - Reporting Tips - Totals / Changing Columns / Changing Parameters / Exporting Search Results