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.
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.
The success of daily deal email illustrates this. Customers gain value from a ‘daily deal' email and will come to anticipate the email in their inbox every morning. Tagging links in ‘daily deal’ emails will tell you a lot about the journeys within a given customer profile, as well as about preferences and behaviours. The ultimate sell is not important – what you are doing with ‘daily deal' (or ‘weekly tips') email content is building a relationship with your customers and learning more about how journeys within your brand work. All this information is important and can be put to use on later campaigns.
Make your offers feel relevant. If you offer people something they don’t think is relevant for them, they also think you don’t know them or understand their situation. Segmenting people based on their interests, problems, company sizes, and other things can help with that a lot. But it’s not enough. Your offer might be a perfect fit for them, but how you present it has to be a fit, too. Focus on describing their problems, how they’ll use the product or service, and what they will have in the end. Don’t talk about it from your perspective. No one really cares what you think about your product as much as they care about what they’ll get from it.
When you're using email as a marketing tool, you're working on a pretty personal basis. This isn't ‘drive-by' stuff -you're directly targeting customers from their inboxes. There's a huge amount of potential which comes with this kind of marketing... but you'll only reap that potential if you REALLY understand both the marketplace you're operating from, and the audience you're talking to.