ProtonMail is a basic email service that is easy to set up because it doesn’t ask for any personal information. You just pick a user name and password, and you’re set. Be aware that some features – such as mail collection and the ability to sync across multiple devices – are only available with its paid email service. But the free version does have email encryption, which is important if you send messages with sensitive information you want to protect. ProtonMail automatically unencrypts the message when it reaches the recipient’s inbox and is opened.
Klaviyo allows e-commerce marketers to target, personalize, measure, and optimize email and Facebook campaigns. Businesses can define their font and brand colors, and Klaviyo will automatically apply them to built-in workflows and any new templates. You can also create new templates based on different pre-built layouts. Other features include one-click integrations, ROI-based reporting, segmentation, autoresponders, personalization and responsive templates.

The most flexible email marketing services offer per-email or pay-as-you-go pricing. While pricing based on your number of contacts is ideal for businesses that regularly send emails, per-email pricing is better for companies that only occasionally send them. Some providers allow you to consult with their email marketing experts for help designing templates and setting strategies for an additional cost. 
MailUp gives businesses the tools to send newsletters, promotional emails and transactional emails from one platform. The MailUp email and SMS delivery platform combines email marketing tools with SMTP relay for transactional emails and plugins for e-commerce, CRM and CMS systems. The service's pay-per-speed pricing is designed for midsized companies looking to scale their email marketing efforts.
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