QQueue.
A self-hosted email platform for campaigns, transactional messages, and scheduled sends, using existing SMTP providers with queues, retries, tracking, and webhooks.
Applications need more than an SMTP connection: queued delivery, retries, scheduled campaigns, and bounce handling. I wanted to reuse that infrastructure across my projects while keeping the choice of email provider.
A self-hosted layer on top of any SMTP provider (Mailcow, SES, Postmark, Resend, Brevo). A BullMQ + Redis queue and workers handle sending and campaign fan-out with backoff and attempt tracking; opens and clicks are signed with HMAC tokens; messy ESP bounce/complaint payloads are normalized to one inbound webhook shape. Everything ships behind a documented REST API and a typed TypeScript SDK, and the whole stack comes up via Docker Compose behind Caddy/TLS.