Maileroo is an all-in-one email delivery platform offering SMTP relay, Email API, and email marketing software for developers and businesses to send transactional and marketing emails reliably.

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🚀 Overview

Maileroo is a robust email service that combines SMTP relay, HTTP Email API, and a full-featured email marketing platform to ensure high deliverability for both transactional (e.g., order confirmations, password resets) and marketing emails (e.g., newsletters, promotions). With servers in Europe (Germany and Netherlands), it prioritizes inbox placement, GDPR compliance, and 99.95% uptime.

The project solves key problems like emails landing in spam folders, high bounce rates, complex integrations, and list management challenges. It provides easy-to-use tools for developers to integrate via API or SMTP, and marketers to build campaigns with drag-and-drop editors, segmentation, and analytics.

Built for developers, marketers, and businesses of all sizes—from indie makers and side projects to enterprises sending millions of emails monthly.

It was built to offer a budget-friendly, scalable alternative with exceptional deliverability, real-time insights, and seamless setup, as evidenced by positive reviews on Trustpilot, Product Hunt, and AppSumo.

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✨ Key Features

• SMTP Relay and HTTP Email API with SDKs for easy integration into apps, supporting bulk sending, templates, attachments, and webhooks (matters for reliable transactional emails without hassle)
• Email marketing platform with drag-and-drop editor, template builder, A/B testing, lists/segments, and form builder (enables targeted campaigns to boost engagement and sales)
• Advanced analytics and logging for opens, clicks, bounces, devices, and countries, plus list cleaning/validation and free email verification API (improves deliverability and ROI)
• Inbound email routing, free sender domain, branded tracking links, bounce handling, and dedicated IPs for high-volume plans (enhances flexibility and reputation)
• Optional: Integrations with 3000+ apps via no-code tools like Make.com, and free SMTP for open source projects

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🛠 Tech Stack

• Frontend: React (dashboard), Laravel (sales website), Bootstrap
• Backend: PHP, Golang (20+ microservices), Rust (KumoMTA for email sending)
• Database: MySQL, Redis (caching/queuing), MongoDB (logs/emails), Pebble (DNS), S3-compatible storage
• Other: RabbitMQ (queuing), Nginx (reverse proxy), Ansible (deployment), BunnyCDN (static assets), Cloudflare (some APIs), ClouDNS (DNS)

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👥 Who Is This For?

This project is useful for:

• Developers who want to integrate reliable email sending via API/SMTP into their apps or side projects
• Marketers looking for easy campaign building, segmentation, and performance tracking
• Businesses and indie makers needing scalable, GDPR-compliant email delivery without high costs

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📸 Screenshots / Demo

• Live demo: https://maileroo.com
• GitHub: N/A

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🔥 Project Status

• 🟢 Actively building

Last updated: 2026-03-24

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❓ FAQ

Is this project free?

Freemium (Free Email API with 3,000 emails/month, free email verification, free SMTP for open source; paid plans and lifetime deals via AppSumo starting at $39 for 15k emails/month).

Is the source code available?

No — proprietary SaaS platform.

Can I contribute?

Provide feedback, feature requests, or report issues via live chat (Crisp), support tickets (Zendesk), or contact the team.

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📬 Contact & Links

• Website: https://maileroo.com
• GitHub: N/A
• Twitter/X: https://x.com/maileroodotcom
• Email: N/A (use support chat)

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