A customer is interested in designing a solution to ensure that subscribers only receive categories...

To enable subscribers to receive only the categories of emails they are interested in:

Publication Lists: Use Publication Lists to manage different categories of email content. Subscribers can choose which lists they want to subscribe to through the built-in subscription center, thereby receiving only the emails that match their interests.

Implementation: Configure multiple publication lists representing various content categories. Integrate these lists with the subscription center to allow subscribers to select their preferences.