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.
If you already have a pretty large database, you also likely have some contacts that have gone quite stale. If so, I recommend running a re-engagement campaign that can help you both scrub your list and prevent the kind of spam and IP issues I addressed earlier, as well as reawaken old contacts that might have forgotten about you, but would actually be great fits for sales.
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.

Win-back: An existing customer is soon approaching the end of his yearly subscription. The customer hasn’t used your product in 3 months and you need a way to win them back and keep them for another year. Create a “win back” email that sends an automated email to all customers that are coming to end of their contract with a list of new product features and a short plan on expected releases in the next six months.

Generating your own list of email contacts who have opted in to receive content from you doesn't just comply with legal regulation and protect your brand reputation. It also presents you with opportunities to grow this list through genuine relationships with new customers. We've already written a post of clever ways to go about doing this, which you can check out here. But below are the basic best practices that have a very big bang for their buck when it comes to consistently growing an email list.


Most people don't think of email as a lead- or contact-generating channel. But because people forward helpful emails to colleagues or friends, it can actually expand your database if you simply make forwarding or sharing email content easy for recipients. Include calls-to-action in your emails that make sharing an obvious choice for recipients, particularly with your most useful assets.
Use your real email signature: Just like using a real reply-to email address, you want to use real contact information within the email and the best way to do that is to include your contact details in the email signature. Giving your readers the opportunity to contact you or connect with you online is a great way to be personal and build a relationship with them.
×