Newsletter list quality (if bundled)
Part of the BannerAdSites evaluation framework. Use this check before buying a placement — what to ask the seller, and how to read the answer.
How was the list built, what is the open rate, and is it double opt-in?
GoodOrganic, double opt-in, open rate disclosed and plausible.
BadBought/scraped list, no open-rate data, single opt-in.