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Transactional Email API

Deliver Every EmailEvery Time

Never worry about lost messages again. MailCub’s powerful API ensures your critical emails reach inboxes fast, reliable, and at scale.

Everything You Need for Transactional Email

Powerful features designed to make email delivery simple, reliable, and scalable.

Lightning-Fast Delivery

Get your transactional emails delivered in seconds, powered by MailCub’s globally distributed infrastructure.

Secure & Compliant

Protect your data with built-in encryption, authentication, and compliance with GDPR and major privacy standards.

Detailed Analytics

Track every send, open, and bounce in real-time with clear, actionable insights to improve your performance.

Developer-Friendly API

Simple, well-documented REST API that integrates in minutes — whether you use Node, Python, PHP, or Go.

Global Infrastructure

Worldwide delivery network for optimal performance

Webhook Support

Real-time event notifications for complete visibility

Perfect for Every Business Need

From user onboarding to order confirmations, our API handles all your transactional email needs.

Welcome Emails

Create a lasting first impression with personalized welcome messages that make new customers feel valued and inspired to take the next step.

Password Resets

Provide quick and secure password recovery options that show your customers you care about their safety and convenience.

Order Confirmations

Keep every customer in the loop with automatic order updates, receipts, and delivery notifications — clear communication builds loyalty.

Notifications

Send real-time alerts, reminders, and important updates that keep your customers engaged and informed at every touchpoint.

Invoices

Automate your billing process with professional invoices and payment confirmations save time while maintaining accuracy and transparency.

Marketing Automation

Nurture customer relationships with smart, data-driven campaigns that adapt to behavior and deliver the right message at the right time.

Seamless Integration for Every Business

Get started in minutes with our powerful, developer-friendly API. Whether you’re sending emails or running marketing automation, our platform integrates effortlessly with your applications to keep communication flowing smoothly.

Integrate seamlessly with our RESTful APIs and start sending emails in just a few lines of code minimal setup, maximum reliability.
Empower your tech team with SDKs for popular languages, real-time testing environments, and clear, comprehensive documentation designed to speed up development.
Stay in control with detailed delivery tracking, performance analytics, and complete visibility into every request and email log.
From authentication to first send, our intuitive setup ensures your integration is quick, secure, and ready to scale as your business grows.
curl -X POST https://api.mail.mailcub.com/api/send_email \
        -H "Content-Type: application/json" \
        -H "x-sh-key: YOUR_API_KEY" \
        -d '{
        "to": "user@example.com",
        "from": "noreply@yourapp.com",
        "subject": "Welcome to our service!",
        "html": "Welcome! Thanks for signing up.",
        "attachment": file
        }'

Transparent Pricing

Start free and scale as you grow. No hidden fees, no surprises.