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.
How to Check if an Email is Disposable (Free Temp Email Checker)
In this guide, you'll learn what disposable emails are, why they matter, and how you can quickly check if an email is disposable.
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.