Elastic Email

Elastic Email has been powering email for well over a decade and keeps a free tier viable. The free plan gives you 100 emails per day with access to both SMTP and API, a drag-and-drop template editor, and basic automation workflows. You also get email deliverability features like authentication setup guidance and bounce management built in.

Elastic Email fits small businesses and marketers who want more than a bare API but don't need the full weight of a dedicated email platform. It sits in the middle ground: simpler than enterprise tools, more capable than bare-bones APIs, and the free tier actually covers real campaigns at low volumes.