The document discusses the results of various email marketing tests, including which subject lines and days of the week perform best as well as whether segmenting emails by topic increases open and click rates. Segmenting emails by topic into categories like holiday activities, beauty treatments, gardening, and local markets increased the average open rate from 46% to 70% and the click rate from 20% to 55%. The recommendation is to do more targeted segmenting based on individuals' interests and focus email design on relevance rather than steering behavior.