Two particularly important groups for our purposes are customers with a one-time purchase and customers who have purchased multiple times. A customer is sometimes not considered to be loyal or repeat customer until they have purchased two to five times, in which case the single purchase segment is more akin to a warm prospect than a loyal customer.
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.
This A/B test indicates that engagement is one problem, but your subject lines are an even bigger problem—and one you can solve right away. CTR rates are understandably lower among the less-engaged group, but you saw engagement increase with a punchier subject line, so there is room to improve CTR among cold leads. CTR rates are higher in the more engaged group, but with a better subject line, this rate could go through the roof.
Purchase (formerly the bottom): This phase should drive the sale, such as a free trial or discount offer. These messages can be much more direct and sales-oriented since these customers have indicated they are closer to a purchase than others. In this phase, it’s important to keep your emails focused on the primary call to action (CTA) and make sure the transaction is as easy as possible. Some companies opt to offer post-purchase set-up assistance or support to help customers move from engagement to purchase.
I've been using Solo Ad Advertising for about half a year now... It was the most responsive advertising I EVER used in terms of RESULTS and, by this, I mean signups and SALES not just clicks on my solos... I used Solo Ad Advertising to promote other ad exchanges and, once, for example, I had a referral upgrade ratio of more than 12%, much better than the general upgrade ratio of that ad exchange... Using Solo Ad Advertising to promote other Ad Exchanges helped me A LOT to earn hundreds of dollars from my referral upgrades and purchases and also from scoring on the top 3 of some referral contests. 

Are you willing to alienate people who disagree with your opinion? Sure, not everyone who disagrees with you will unsubscribe. But if you can’t take the risk of alienating a large portion of them, it’s better to avoid the topic. The only exception are friendly disagreements. For example, it can be a good idea to show your support for a specific sport team, even if you know many in your audience like another team. As long as they don’t take the sport very seriously, it can be just a fun thing to talk about. I could, for example, tell that I’m more of a dog person (we have two dogs) than a cat person. I have nothing against cats, but I like walking with dogs. I doubt almost any cat person will hold that against me.
Purchased lists are ineffective, and they impact everyone else who uses Mailchimp, too. If you send emails to a list of people whose contact info you bought, many of the emails will get identified as spam. Some spam filters will flag a campaign if anyone with the same IP has sent spam in the past. When you use Mailchimp, your email is delivered through our servers, so if one person sends spam, it could prevent other users’ emails from reaching inboxes. But by forbidding Mailchimp users from using purchased lists, we increase deliverability for everyone.

The transition email – Remember, every potential customer is currently using something else to do what your product could do for them, and the act of switching from that process to using your product is a barrier you need to overcome. This email should focus on outlining a simple and easy process for making the switch from their existing solution to using your product to solve their problem.
Demographics: Certain demographics like age, gender, job title, and other information that informs your buyer personas can be a good way to segment customers and customize messages. For example, a financial company may want to send retirement-themed emails to customers seeking information on offering their employees benefits and emails about college loans to university-based customers.
Part of the problem is that people are confused about the difference between ‘strategy' and ‘tactics'. It's essential not to get these two confused. They are related – tactics are a vital part of what makes a strategy work – but they’re not the "be all and end all." Too many people neglect a full and comprehensive strategy in favour of a bunch of loosely-connected tactics. So, to recap:
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