Lean SMTP is a minimal, no-upsell WordPress plugin that improves email deliverability by routing all wp_mail() calls through professional mail services. It supports plain SMTP as well as dedicated API transports for Amazon SES, Mailgun, and Resend. The plugin includes failure alerts, an optional send log, encrypted credential storage, and WP-CLI support. It sends no telemetry and contains no paid features.
Lean SMTP is a Business & Operations project. Poor email deliverability caused by using a web host's default PHP mail function. Lean SMTP is a B2B product aimed at wordPress site owners and developers needing reliable transactional email. It is available for free. It runs on the web, and it can be self-hosted.
pjaudiomv builds and maintains Lean SMTP, and it first shipped in 2026. Among its 5 catalogued features are SMTP Routing, API Transport Support, and Failure Alerts.
Summary written by a language model from the project’s public pages.
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