Magento email marketing extensions allow you to create and send emails directly from your store's control panel. You can integrate them with Magento, and they'll work seamlessly on a single platform. Magento email marketing extensions have different features: 1) A/B Testing - this feature allows you to test different versions of your email campaigns before sending them out so that you can see which ones perform better. 2) Campaign Builder - this feature allows you to create personalized campaigns on the fly, making it easy for your customers to take action by using dynamic fields within each campaign template. 3) Automations - these automated sequences of messages are triggered by certain actions performed by customers during their shopping experience on your site. For example, if someone adds an item into their cart but doesn't check out during their first visit, an automation sequence could send out an offer discounting items in the cart once they come back later in order to get them back as customers.
Magento does not offer email services, but they do have third-party email marketing app integrations you can use for your online store. The integrations allow email marketing extensions to pull customer, product and order data into an email campaign builder. This approach will save you from having to manually add contacts to a mailing list and merge lists from multiple sources. The integration is also useful if you want to implement smart features like dynamic content in emails.
As of today, Magento integrates with 101 email marketing extensions. Each of these email extensions comes with different features, services, pricing, and templates you will need to vet out to find the best fit for your online store.