Posthorn

Self-hosted email gateway between your apps and a transactional mail provider, one Docker container.

Servicefreeglobal

Posthorn is a free, open-source, self-hosted email gateway that sits between a user's self-hosted apps and a transactional mail provider like Postmark, Resend, or AWS SES, deployed as one Docker container with a single config file. It's aimed at self-hosters running several apps who want one consistent outbound mail layer instead of configuring email delivery separately for each app.

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