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.
Remember, data collection is a two-way street. People won't give you their data for anything. So, think about how you are managing your subscribers' expectations. How clear is it to new recipient what they are going to be receiving from you? Try and get a good a feel for the experience of the person receiving your data collection methods as you can at this point.
Beyond that, avoid using all caps, too many exclamation marks, and hyperbolic phrases ("ACT NOW BEFORE TIME RUNS OUT!!!!"). Poorly formatted HTML in your emails can also hurt how they’re handled. Every spam filter is different, so an email might pass through one filter but get flagged by another. For more comprehensive info on how spam filters work and how to avoid them, check out this guide by MailChimp.
Bloggers are the most obvious example of focusing on this email marketing strategy almost exclusively. SaaS (Software as a Service) businesses are another group that typically heavily emphasize content emails. Of course, bloggers, SaaS businesses, and everyone else can send content emails while also using the other email marketing strategies. And you should do it, too.
Make it scannable. Your subscribers are busy people who get a lot of email, so it's safe to assume you don't have their undivided attention. Instead of one long block, break up your content into short paragraphs. Include subheadings and images to guide readers through your email and make it easier to scan, and add a teaser to the top of your newsletter to tell subscribers what's in store. If you're sending a long article, consider inserting a "read more" link so people can get to the rest when it's convenient for them. Your subject line should be to-the-point and easy to digest, too. You might even want to a/b test subject lines to see which ones perform best.