Blog
Guides, tutorials, and engineering notes from Reloop Labs on email infrastructure, deliverability, self-hosting, and transactional email.
Why We Open-Sourced Our Email Infrastructure
The story behind Reloop: why we built an open-source alternative to SendGrid, Resend, and Mailgun, why email infrastructure is too critical to rent forever, and what we're changing.
IP Warming Schedule Guide: How to Build Sender Reputation (2026)
A comprehensive, practical guide to warming new sending IP addresses — with an exact week-by-week volume ramp schedule, recipient segmentation strategy, throttle limits, and deliverability monitoring.
Why Your Emails Land In Spam & How to Fix It
The definitive guide to diagnosing and fixing email spam folder placement — covering authentication, content, reputation, list hygiene, and ISP-specific issues.
Introducing Reloop: Open-Source Email Infrastructure Developers Actually Want to Use
Open-source email infrastructure for indie hackers, startups, product teams, and enterprises. Ship transactional mail, agent inboxes, and inbound on Reloop Cloud or self-host—same product, no lock-in.
SPF, DKIM, and DMARC: The Complete Setup Guide (2026)
A thorough, practical guide to configuring SPF, DKIM, and DMARC for your sending domain with exact DNS records, common mistakes, and a step-by-step verification checklist.
How to Send Email in Next.js App Router (2026)
Send transactional email from Next.js App Router with Reloop — complete Server Action and Route Handler examples, env setup, error handling, and Vercel deploy.
Ship your first email in minutes
Open-source, deliverability-focused, and yours to self-host or run on Reloop Cloud. No lock-in, no rewrite later.