The days of not knowing and understanding your customer are gone. Read that line again. Gone.
Email algorithms will quickly deposit brands with a poor reputation into the spam box. In addition, the novelty of emails has faded for the reader. Email is increasingly routed directly into a spam box by inbox rules set up by savvy buyers who are sick of marketers wasting their time.
Stop wasting time on ineffective emails. Learn to create targeted and effective email campaigns that will move a buyer through their journey.