Customer.io is an email marketing tool that can be used by various different roles within your business including marketers, product managers and of course, growth hackers. Users can send targeted emails to your visitors on your website or to mobile app users depending on their activity. You are notified when they have read your email and/or if they click on one of the links. It also includes A/B Testing capabilities.
Anthropologists, sociologists and historians have used mailing lists as fieldwork.[6] Topics include TV series fandom,[7] online culture,[8] or scientific practices[9] among many other academic studies. From the historian's point of view, the issue of the preservation of mailing lists heritage (and Internet fora heritage in general) is essential. Not only the text of the corpus of messages has yet to be perennially archived, but also their related metadata, timestamps, headers that define topics, etc. Mailing lists archives are a unique opportunity for historians to explore interactions, debates, even tensions that reveal a lot about communities.[10]
This email from Loft aims to demonstrate their understanding of your crazy, mixed-value inbox. In an effort to provide you with emails that you actually want to open, Loft asks that their recipients update their preferences to help them deliver a more personalized experience. This customer-focused email is super effective in making the recipient feel like their likes, dislikes, and opinions actually matter. 
The takeaway here is that if you are to use personalization as an email strategy, do so in a meaningful way. It takes little knowledge or relationship to place someone’s name in your greeting. It shows far greater care to send personalized email that is specific to a recipient’s needs and history. Again, an example from my inbox, this email from Rdio dispenses with the formalities and simply provides an update on music I actually listen to.

Email marketing is one of the most cost-effective ways to promote your business, whether your goal is to build your brand or sell more stuff. Our field guide provides everything you need to know to make the most of this platform. Learn how to create an email marketing plan, design effective emails, and test them. Then discover the power of automation and how to measure the success of your emails.
"The main email applications are copy writing and dynamic content selection. The latter providing the best in personalization. The aim of providing the right message for each person will never change it’s the method to achieve it that changes. This trend is most relevant to brands with relatively varied audiences or many and diverse products (SKUs).
Dynamic segmentation – As alluded to earlier, you can’t just send out a generic message to everyone on your list. While basic demographic data can be used to segment your list, that’s far from taking the dynamic approach. Automation tools can help you segment your list as they go through the funnel, allowing you to send personalized messaging depending on their actions and behaviors.
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