Disable Default Reviews from Volusion:
Step 1: Log in to the admin section of your Volusion Store.

Step 2: Select Inventory menu -> Choose Products

Step 3: Products menu -> Click right side three dots -> All Product Settings

Step 4: All Product Settings - > Enable Customer Reviews ( UnCheck the checkbox value) -> Save

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Export Subscription List from Volusion:
Step 1: Log in to the admin section of your Volusion Store.

Step 2: From the top navigation menu, select Inventory Then select Import/Export from the drop-down menu.

Step 3: Click over to the STANDARD EXPORT tab. From the Export From the drop-down, select Customers.

Step 4: In the "Columns" section, select Check All or check the columns you want to be included
Note: for email subscribers check FirstName, Last Name, Email Address, and Email Subscription

Step 5: Use the Export option with csv file.