Unsubs, open rate, bounces, - yes. I would be more concerned by people who do not bounce, read, sub or press the 'x', lose affinity, return to the site again l

Unsubs, open rate, bounces, - yes. I would be more concerned by people who do not bounce, read, sub or press the 'x', lose affinity, return to the site again later, get the popup again, lose affinity even more, and then bounce, never come back, and get an unpleasant feeling whenever they see my links show up some place else. That's the pattern that I would expect. Or people who sub and then stop opening the emails. Because these popups are mostly going after a b2b type customer base I would expect them, like me, to mash the upper right corner of those boxes (which look awful on phones) before it finishes loading. Anything non-interruptive is a better experience, because the ultimate goal is not to get them to surrender their email but to get them to become a customer and recommend the products and services.