ProtonMail was founded in 2013 by scientists who met at CERN and were drawn together by a shared vision of a more secure and private Internet. Since then, ProtonMail has evolved into a global effort to protect civil liberties and build a more secure Internet, with team members also hailing from Caltech, Harvard, ETH Zurich and many other research institutions.
For any business user or organization today, the decision to use email is a no-brainer. Business simply can't be done in many cases without it. But that doesn't mean you can interchange email platforms or service providers at will. Digging into the capabilities of these services reveals a great deal of additional feature scaffolding that surrounds almost every email implementation by necessity.
While pricing varies by provider, the cost structure is usually the same. Most email marketing providers charge a monthly fee based on contact list size, with a range of packages and plans. With this structure, most providers allow you to send out an unlimited number of emails each month and have enough different plans to fit into the budget of any business. 

Pay attention to the amount of inbox storage available, because once you reach the cap, you’ll have to  start deleting messages in order to receive more. Many free email services offer a terabyte or even unlimited storage, which is helpful if you tend to receive messages with large attachments, like image and video files. However, even a few gigabytes of storage gives you enough space to hold between 100,000 and 300,000 messages.


And that leads us right into understanding service pricing and packaging. The email marketing services we reviewed range from about $5 per month to as much as $20 per month for a range of features. Many email marketing plans include unlimited email sends each month and bill you based on the number of subscribers. If you have a small list, then look for a company that offers a free plan, a low-cost plan for several hundred subscribers, or even a pay-as-you-go plan. On the flip side, many of these services also offer high-volume plans with up to 100,000 or more contacts. Sometimes this requires a custom plan that has to be arranged directly with a sales rep. If you're willing to commit, then look for the companies that offer discounts if you pay yearly rather than monthly. A few offer also money-back guarantees.
On a more basic level, AI improves email marketing mechanics such as A/B testing and smarter audience segmentation. This can have immediate benefits in terms of optimizing your marketing strategies for different customers and sending the right content to the right people. On a more advanced note, AI can actually optimize email content for specific audiences and product campaigns. Additionally, it can help with personalizing email content right down to the individual customer level, depending on how much information you can feed it from your CRM and sales systems. Strong stuff, which means determining exactly how a potential email marketing service has implemented AI should be a key criteria for most marketers before purchasing.
Getting started shouldn't be daunting. Generally, you'll know right away whether you like a user interface (UI) or not, and most of the contenders we reviewed offer free trials so you can poke around before dropping any cash. Luckily, most of these services have modern-looking graphics and uncluttered layouts. These are not the complex business software UIs of yesterday. Be careful, though, as some free trials require a credit card. This means you need to be sure to cancel your trial before you're billed if you're not happy with the service.
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