swoosh

Includes adapters for over 20 email services like SendGrid, Mailgun, and SMTP, allowing seamless provider switching without code changes, as listed in the README's adapter table.

Uses a fluent, composable Elixir API for building emails with attachments, HTML/text bodies, and custom headers, aligning with Elixir's functional programming strengths.

Provides dedicated adapters for unit tests (Test), async-safe tests (Sandbox), and local development previews, simplifying email testing across different environments.

Emits events for email delivery start, stop, and exceptions, enabling monitoring and debugging in production, as documented in the Telemetry section.