It is imperative you must know about this sooner or later. If you are into e-zine publishing right now, this set of criteria will significantly enable you to tweak your layout and presentation to suit your subscribers' taste in general. It's brief but better than nothing.
Newletter readers like:
Easy-to-skim designs Short articles Interesting subjects Good visuals Calendars Bulleted Lists Content telling how to make money/save time Offers and Benefits
Newletter readers DON'T like:
Intimidating pages Disorganized information Long, continuing articles Overly frequent mailings Irrelevant content Impersonal tone Receiving multiple copies Chaotic page design Too many pages