Free email services do cap the number of email messages you can send out per day. This is to cut down on spam messages sent with their services. The cap is generally around 100 messages per day, which is sufficient for keeping in touch with family or other personal email uses. But if you need an email service for business purposes, it may be better to purchase an email service that permits unlimited messages each day.
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.
Odoo Email Marketing is an easy-to-use application that allows you to create email campaigns without any IT knowledge. It offers an extensive template library, a drag-and-drop editor, detailed analytics and campaign segmentation. The Odoo Online version (SaaS) allows you to have up to 1 million subscribers and can be used as a completely free stand-alone app with a limit of 400 emails per day. The app can be fully integrated with all other Odoo business apps.
According to Mitch Stephens, a security consultant for Emagined Security, email attacks are the most common internet threat. “An attacker can send a link that looks similar to another link you are familiar with,” Stephens told us, and when you open it, you’ll see a site that looks legitimate and asks for your login information. Once you enter it, the attacker then has your credentials to log into the real site and gather even more personal information. These are known as phishing schemes, or phishing attacks.

Most companies offer tutorials and support for their services. Using the trial version of each program, we evaluated layouts and looked for things that would make the platform user-friendly. For example, are the icons easily identifiable? Is it apparent where to go to begin to build a survey and distribute surveys to users? How easy is it to create or change a survey? We found that the best survey builders allow you to quickly edit questions and rearrange the order of your survey without many additional steps. 
We narrowed the 16 free email services to eight that we believe are the best options. We eliminated services that allow you to send free email messages but won’t let you receive messages without purchasing the service. We also discounted services that currently have free email accounts available but are either no longer offering support or have plans to discontinue them. We didn’t feel comfortable recommending a service that may not be around long term.
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.
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