Focus follow-up content on only 5-10 topics that customers care most about, because people can't hear their desires or what they want to avoid too often—you can create 100 newsletters from just a few

Eben states he's created 100 email newsletters that were 10 pages long using only 5-10 topics, giving the example of house buying with three hot buttons: paying least, avoiding money pits, and ensuring resaleability.