I got tired of paying Resend/SendGrid prices for transactional email, so I built a self-hosted alternative

Like a lot of people here, I run most of my infra myself. But email was the one thing I kept paying a third party for. Every self-hosted "email server" project I tried was either a full mail server (way more than I needed) or too fiddly to trust with actual deliverability. So I built Reloop, a self-hosted transactional email service you run on your own box. REST API + SMTP, domain/DKIM setup, inbound mail, webhooks for delivery/bounce events. Basically the parts of Resend/SendGrid I actually use, minus the monthly bill and the vendor lock-in. GitHub: github.com/reloop-labs/reloop Still early — deliverability tuning (SPF/DKIM/DMARC, IP warmup if you're sending from a fresh box) is the part I'd love feedback on from people who've fought this battle before. What's everyone currently using for this? Curious if people are just running Postfix + a custom API layer, or if there's a project I missed.