It's really about whether the email is commercial or relationship content. This is a subjective point for mixed emails, and the ACM TechNews email does in fact

It's really about whether the email is commercial or relationship content. This is a subjective point for mixed emails, and the ACM TechNews email does in fact mix the two by containing banner ads and links to the ACM's social media sites. If you are sending "relationship" email, you are exempt from some of the act's restrictions. It does seem that if you are classifying it as a relationship email then you only need to obey the truthful routing information. However, being unable to unsubscribe I believe is also a violation regardless of the status of the email, but I'm less clear on this.