GrandNode enables you managing subscribers.
From the 3.90 version you are able to create several newsletter categories. You will give your customers possibility to choose category of newsletter if it is defined. You can create unlimited amount of newsletter categories. Go to Promotions -> Newsletter Categories. Newsletter categories window will display, as follow:
To add new category click Add new button in the top right corner of table. Window of adding new category will display:
Name - Name of category, it will be displayed after subscribing.
Description - Description of category
Selected - Is that category should be preseleted?
Display order - Display order of that category
You can also make category limited to stores.
On the public store, customer will see pop up as above.