You can send marketing to customers who have chosen to opt in only. This information can be accessed in the legacy promotion centre currently.

Once logged in head to the 'analyse' tab at the top of the page.

Then on the right hand side of the page click 'Customer Marketing Report'.

Using the drop down menu select which event you would like to download the data for. You can also choose to select a start and end date if you so wish. Select 'show data'.

Once selected the data will be displayed, you can download this as a CSV.