How to combine engagement scoring with validation data?
Still have a question, spotted an error, or have a better explanation or a source we should cite?
Here's the trap: someone might be inactive because they don't want your emails, or because they've never actually received them. One signal tells you behavior, the other tells you deliverability. You need both.
Low engagement + valid address. This subscriber could get your email but isn't opening it. That's a clear choice. Try re-engagement campaigns or reduce sending frequency. They're uninterested, not unreachable.
Low engagement + validation flags. This is different. Their address might be a catch-all, a role account, or degraded. Their silence might not be disinterest at all. Undeliverability looks a lot like disengagement. Before you write them off, verify the address is actually working.
High engagement meets declining validity. Watch out here. Someone actively engaged but showing validation warnings might be abandoning that email account. Reach out separately to collect an updated address while you still can.
Validate regularly, not just at signup. Address quality decays over time. A validation service catches role address conversions, expired domains, and spam traps. Check your list every few months, especially the engaged segment.
The combination prevents two costly mistakes. You won't suppress someone who never got your mail. And you won't keep mailing addresses that can't actually receive anything.
Contributors
Who worked on this answer
Every name links to their profile. Every company links to their site. Real people, real accountability.
