S • Segment. Market research and data analysis heavily inform this first step. You can also use marketing personas and the like to help. Your primary aim with this step is to identify differing customer needs according to relevant markers (e.g. demographic, behaviour, occupation, interests...). You then divide your market into ‘segments’ according to these needs.

When it comes to deciding how to craft that perfect subject line, there appears to be really only one area to avoid: the subject line of 60 to 70 characters. Marketers refer to this as the “dead zone” of subject length. According to research by Adestra, which tracked over 900 million emails for its report, there is no increase in either open rate or clickthroughs at this 60-to-70 character length of subject line.
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