Mailgun

Mailgun is built for developers who need straightforward email infrastructure without frills. You get reliable delivery, detailed event logs, and the flexibility to send email however your system needs to (API calls, SMTP, webhooks). It's particularly popular with online stores that need predictable, affordable email delivery.

The platform doesn't include advanced marketing features like visual builders or sophisticated segmentation. That clarity of purpose makes it a practical choice for stores whose email needs are straightforward.