| Name | Pros | Cons | When to use |
|---|---|---|---|
free, easy to maintain | limit 500 sends a day, not a CRM | relatively low volume receipt emails | |
strong API support, transactional emails | more technical to set up | for transactional emails | |
connected with Mailchimp, simple analytics and tracking | cost money | large volume receipt emails | |
strong, integrated CRM | can't send the same campaign to the a contact twice | campaigns, requires tracking |