Ask HN: Email Tracking

I run a service that emails users new vulnerabilities custom to their stack on a weekly basis, but I'm finding very limited options out there for good email tracking and analytics. The mail service I use has the basics like opens and link tracking but is there any service out there that can do a bit more? I'm looking for data such as inferring scroll depth, per email address tracking, just wondering what the state of the art is in the space.