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.

At worst, you might think I’m a bit weird for caring so much about sound quality. Or you might think I’m really weird if you knew that my loudspeakers are computer calibrated to my room. Or you might question my priorities if you knew I set up my office, so that my desk is nearly in the middle of it… mainly to be able to enjoy music better. But we’re all weird in some ways (and I’ll let you think this is the weirdest thing about me).

Sample review: “After using it (Sortd), you’ll be hard-pressed to imagine this tool isn’t going places. Create custom columns, such as ‘To-do,’ ‘Follow Up,’ or ‘FYI’ — the possibilities are nearly endless. Then, when an email comes in, simply drag it to the appropriate column. You can even set reminders, add notes, or change the title of the email. You can also set individual emails to “snooze” so that they are relegated to the bottom of your list until the snooze is over, at which point it pops back up at the top.” — B2B PR Sense Blog
Will people understand what you’re trying to say? It’s usually better to avoid topics (or opinions) that are complex if many people are extremely passionate about them. For example, sharing almost any opinion about immigration policy is usually a bad move, unless your audience is unusually homogenous. You could agree 99% with someone and still piss them off by using the wrong term just because they have such a strong “either you agree 100% with us, or you’re our enemy” mentality. I once pointed out that I think it’s unacceptable to capture and torture people for years—especially if they aren’t charged with any crime, there’s no evidence they’ve done anything wrong, and they’re children. I got several emails back from people saying, “you have no idea what you’re talking about” or “you should stick to marketing and leave politics to people who understand it.” They took it as commentary on geo-politics. I just said I’m not okay with pointless torture of children. I thought we’d all agree on that.
Reach Mail is great for business just starting out with email marketing. It offers a free package that enables users to create, schedule and send emails, as a well as a paid version that provides users with more customisation options. The free version is quite unique in the email marketing world as normally these types of tools are only free for a certain period. Reach Mail also includes a nice testing feature which enables users to test their email campaigns on a percentage of their subscriber list.
The enhanced tracking option links to your website through Salesforce or Google Analytics.  To use “auto-responders”, you must have a paid account – you can automatically trigger specific responses or segment users based on actions they take. After sending out your emails, MailChimp allows you to integrate your social channels to post regular updates on Twitter and Facebook.

Marketing emails need to be personalized to the reader and filled with interesting graphics. Few people want to read emails that are addressed "Dear Sir/Madam" -- as opposed to their first or last name -- and even fewer people want to read an email that simply gives them a wall of text. Visuals help your recipients quickly understand what the point of the email is.


ConvertKit is a very easy-to-use email marketing tool, “built by creators, for creators”. This somewhat newer tool helps marketers, bloggers, writers take their email lists and grow their business through forms, trackable data and automations. It also has very digestible reporting for subscriber acquisition, an extensive knowledge base and email support.

Mailjet is an all-in-one email marketing solution used for sending, tracking and delivering marketing and transactional emails. Some highlight features include its intuitive email editor (e.g. drag-and-drop and ready-to-use newsletter templates), personalisation, smart market segmentation, contact management, as well as a free plug-and-play email API.
A mailing list archive is a collection of past messages from one or more electronic mailing lists. Such archives often include searching and indexing functionality. Many archives are directly associated with the mailing list, but some organizations, such as Gmane, collect archives from multiple mailing lists hosted at different organizations; thus, one message sent to one popular mailing list may end up in many different archives. Gmane had over 9,000 mailing list archives as of 16 January 2007. Some popular free software programs for collecting mailing list archives are Hypermail, MHonArc, and FUDforum.
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).
Be sure to look at the tech support offered by each of these companies, as many weren't as available as we would have liked. You'll find that some offer 24/7 phone support, live chat, and email help, while others leave you to rely on online documentation and limited live support hours. The best services offer a combination of self-serve help resources—where you can search FAQs and articles to find your own answers—as well as live support via chat or phone when you can't solve an issue yourself. We cover all of these concerns in our reviews, plus you can get an overview in the feature chart above.
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).
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