Create or Edit Pools 

The pool page is designed so that you can create new pools or edit existing ones. Choose the pool from list box in the left side of Reports page. If you want to edit pool click on Pools settings button. On the next page you will see a list of all pools. To create or edit  pool click on New or Edit buttons. 
There are some pool settings you should specify. In the column description input the pool's name. In the Send to Email column choose which Email to be use - contact Email, subscription Email  or both.
If there are  customers with  the same contact Email you can specify Emails to be send to them only once as check the Avoid duplicates checkbox.
The default letter column is to specify default letter. Reply name and Reply Address columns specify reply name and reply address.
Click on Save button to save the pool's settings.