Facts about engagement

It is reality that ISPs look at the population of recipients that a mail stream is going to.
It is reality that they evaluate the activity of that population.
It is reality that ISPs treat senders that are sending to a significant number of email addresses that have not been logged into or accessed recently negatively.
If you’re having delivery problems, looking at the recipients and their activity is part of troubleshooting the issue and identifying a path back to the inbox.
You can use web and purchase data as a measurement of engagement IF you have, at some point, directly linked the email address and the user.
If you don’t have something that demonstrates a direct link between the person and the address, then it’s a crapshoot as to whether or not that email address belongs to who you think it belongs to.
Happy Friday everyone. It’s been a week.