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.
What's the difference between them? One-off communications versus prolonged, email-based interactions. For example, email marketing tools are excellent for one-off communications. You can use these tools for the one time you'd like to send someone an automated email response when they join a subscriber list, on their birthday, or when you promote a new product. But marketing automation tools are better suited for prolonged, email-based interactions. For example, you can use marketing automation tools whenever you want to guide someone from a subscriber list to a product purchase. Or you can send thank-you emails or send new product promotions—all without having to lift a finger after the workflow is designed.

An electronic mailing list or email list is a special use of email that allows for widespread distribution of information to many Internet users. It is similar to a traditional mailing list – a list of names and addresses – as might be kept by an organization for sending publications to its members or customers, but typically refers to four things:
Keep the subject line and pre-header short: The subject line is crucial. Keep it short so the reader knows exactly what the email topic is about. And the pre-header text (also known as snippet text), don’t let it go to waste by using “To view this email in your browser…”. Instead, summarize the email or include a call to action (i.e., Use “FREESHIP” to get free shipping).
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.
Sending out emails is a seamless process. Just give your campaign a title, set your recipients, design your email and choose the time to send. Pick from twenty default templates with fully customizable options or upload your own. HTML-savvy users are going to be pleased with the advanced editing option. The editor also lets you add, delete, and rearrange sections of your email like text boxes, images, QR codes, social media elements, and Google Maps.
Sender Score is Return Path’s comprehensive reputation measurement. Sender Score is a number between 0 and 100 that identifies your sender reputation and shows you how mailbox providers view your IP address. Your Sender Score is like a bank running your credit score to gauge your credit history. Knowing your score is the first step to improving it (and therefore your email deliverability).
Non-promotional emails, on the other hand, will be less sales-driven and timely, and more focused on building relationships and providing value to your customers. While promotional email campaigns generally tend to yield a higher click-through rate, non-promotional messages allow you to see what interests your email subscribers so you can segment accordingly. You can follow up later with more targeted messages that help to nurture your relationship with these audiences.
Discussion lists often require every message to be approved by a moderator before being sent to the rest of the subscribers (moderated lists), although higher-traffic lists typically only moderate messages from new subscribers. Companies sending out promotional newsletters have the option of working with whitelist mail distributors, which agree to standards and high fines from ISPs should any of the opt-in subscribers complain. In exchange for their compliance and agreement to prohibitive fines, the emails sent by whitelisted companies are not blocked by spam filters, which often can reroute these legitimate, non-spam emails.[11]
A web-based interface is often available to allow people to subscribe, unsubscribe, and change their preferences. However, mailing list servers existed long before the World Wide Web,[1] so most also accept commands over email to a special email address. This allows subscribers (or those who want to be subscribers) to perform such tasks as subscribing and unsubscribing, temporarily halting the sending of messages to them, or changing available preferences - all via email. The common format for sending these commands is to send an email that contains simply the command followed by the name of the electronic mailing list the command pertains to. Examples: subscribe anylist or subscribe anylist John Doe.
Surprise: Customer loyalty is the key to success. And you can reward your loyal customers by giving them something for free every now and then. Create a “surprise” email that sends an automated email to your best customers that offers a free yearly license to your software for them to use, a gift card or even a coupon code to redeem a box of cupcakes. It’s a small cost for your business but, the reward is huge!
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