Overview

Mailtrap Email API/SMTP is a reliable email delivery service designed for developers and businesses to send transactional and bulk emails at scale. Whether you're sending password resets, order confirmations, or marketing campaigns, we ensure your emails reach the inbox.

What is Email API/SMTP?

Email API/SMTP provides two powerful methods for sending emails:

• RESTful API: Modern, flexible API for programmatic email sending

• SMTP Service: Traditional protocol compatible with any email client or library

Both methods offer the same features, deliverability, and analytics - choose based on your technical requirements.

Key Features

Reliable Delivery

• Enterprise-grade infrastructure: Built for reliability and scale

• Automatic Failover: Redundant systems ensure delivery

• Smart Routing: Optimal rules selection for each email depending on recipient MX

Analytics & Monitoring

• Real-Time Analytics: Track opens, clicks, bounces instantly

• Detailed Email Logs: Full visibility into email journey

• Custom Categories: Organize and analyze by type/templates/etc

• Webhook Events: Real-time notifications for email events

Deliverability + Support

• Deliverability and Support teams: helps with migration, monitoring and all questions you might have

• Complete Deliverability Guide: Best practices for optimal inbox placement

• Domain Authentication: SPF, DKIM, DMARC setup

• Dedicated IP + Warmup: Gradual reputation building

• Suppressions Management: Automatic bounce handling

• Feedback Loops: ISP complaint processing

Developer-Friendly

• Official SDKs: Node.js, PHP, Python, Ruby, and more

• RESTful API: Simple JSON-based communication

• SMTP Integration: Works with existing email libraries

• Sandbox Testing: Test before production

Use Cases

Transactional Emails

Perfect for critical user communications:

• Password resets and account verification

• Order confirmations and shipping notifications

• Appointment reminders and alerts

• System notifications and updates

• Two-factor authentication codes

Bulk Emails

Dedicated infrastructure for marketing:

• Newsletters and announcements

• Promotional campaigns

• Product updates and releases

• Event invitations

• Customer surveys

Quick Start Guide

1

Choose Your Integration Method

API

curl -X POST "https://send.api.mailtrap.io/api/send" \
  -H "Authorization: Bearer YOUR_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "from": {"email": "[email protected]"},
    "to": [{"email": "[email protected]"}],
    "subject": "Hello from Mailtrap!",
    "text": "Welcome to Mailtrap Email API"
  }'

SMTP

Node.js SDK

2

Verify Your Domain

Add DNS records to authenticate your sending domain and improve deliverability.

3

Start Sending

Begin with transactional emails, then expand to bulk campaigns as needed.

Two Streams Architecture

Mailtrap separates email traffic for optimal deliverability:

Stream	Purpose	Features
Transactional	Triggered user emails	High priority, immediate delivery
Bulk	Marketing campaigns	Built-in compliance, unsubscribe management, separate suppresion list

Getting Started

Setup & Configuration

• Sending Domain Setup

• API Integration

• SMTP Integration

• IP Warmup

Essential Features

• Deliverability Guide

• Email Templates

• Analytics & Reports

• Deliverability Features

Why Choose Mailtrap?

For Developers

• Clean, well-documented APIs

• Multiple integration options

• Comprehensive SDKs

• Sandbox environment for testing

For Businesses

• High deliverability rates

• Detailed analytics and reporting

• Scalable infrastructure

• Enterprise-grade reliability

For Teams

• Multi-user access control

• Shared resources and templates

• Collaborative workflows

• Activity logging

Support & Resources

Need help getting started or have questions?

API Reference FAQs Troubleshooting Contact Support

Next Steps

1

Setup & Configuration

Authenticate your sending domain

2

API Integration

Choose integration method - API or SMTP

3

Email Templates

Design reusable emails

4

Analytics & Reports

Track your email metrics