Effortless Email Forwarding for Custom Domains

ImprovMX is an effortless email forwarding service that lets you send and receive emails using custom domains without needing to host email servers.

🚀 Overview

ImprovMX provides a simple, reliable way to forward emails from custom domain aliases to your personal inbox, solving the hassle of setting up and maintaining full email infrastructure. It offers fast delivery (under 5 seconds on average), advanced routing options like regex aliases and catch-alls, and SMTP for sending professional emails from your domain.

The service is built for indie makers, developers, small businesses, and side projects who want quick, privacy-focused email solutions for multiple domains. Founded in 2013 as a bootstrapped side project by Antoine Minoux and Cyril Nicodème, it was acquired in 2025 and now serves over 250,000 users, forwarding 30M+ emails monthly under CEO Matthew Tse.

ImprovMX was created to make custom domain email accessible, reliable, and spam-free, prioritizing user privacy (GDPR compliant, no data selling) and high uptime (99.99% SLA) with a forever-free tier.

✨ Key Features

Effortless email forwarding with catch-all, regex aliases, and customizable routing rules (what it does: route to multiple destinations, webhooks, or blackhole; why: flexible for complex needs)
SMTP email sending from custom domains (ensures consistent branding without 'via' tags or provider risks)
Email logs for troubleshooting and API for programmatic management (paid plans)
Fast & reliable: <5s delivery, handles millions daily, auto-resends for deliverability

Optional: Priority support, data migration, white-label MX on paid plans

🛠 Tech Stack

Hosting: AWS auto-scaling infrastructure
Architecture: Custom solutions merged with open-source software, optimized for email deliverability and performance
Other: Multi-MX setup (mx1/2.improvmx.com), SMTP server

👥 Who Is This For?

This project is useful for:

Developers who want to quickly add custom email to apps or sites without servers
Teams looking for scalable forwarding for multiple domains and aliases
Indie makers building side projects needing professional email on a budget

📸 Screenshots / Demo

Live demo: https://improvmx.com
GitHub: https://github.com/improvmx

🔥 Project Status

🟢 Actively building

Last updated: 2026-03-24

❓ FAQ

Is this project free?

Freemium (Free plan: 1 domain, 25 aliases, 500 emails/day; Premium $9/mo: 30 domains, 100 aliases/domain, 5k/day; Pro $24/mo: 100 domains, 200 aliases/domain, 15k/day; Enterprise custom. Yearly 15% off, cancel anytime, full refund on request.)

Is the source code available?

No — closed source to protect privacy, focus on service improvements, and due to complex server architecture (may release in future).

Can I contribute?

Core is closed source; contribute to open-source CLI tool via PRs/issues at https://github.com/improvmx/cli. Send feedback/suggestions to support@improvmx.com.