sAlthough we are inundated with social media, texts, tweets and phone calls, one could argue that the inbox has become our "virtual dojo, our place of solitude amongst the chaos", as Neil Patal so eloquently states. That is why the time is ripe for email marketing. Here's the basic and I've added some great links to check out to learn more about what email marketing can do for your business.
Email Marketing companies
There are loads of great options out there for great companies that offer great email services. Many of them overlap with what they can do and some stand out at being the only ones or better at one aspect or another. Whichever third-party you choose to use, think about a couple of things: a past company that you have already started using can make things easier, using a company that integrates well with WordPress is key but also compatible with your other plugins that you are using, and obviously think about price. The more you spend on a email marketing company the more tools and customizations you can make.
Here's a great guide to what's out there - check it out here!
The Creative Counter recommends MailChimp as this is a powerful tool that integrates well with most projects.