Mailjet – Transactional Email API and Marketing Platform

Overview

Mailjet provides an email service platform designed for both transactional and marketing email communication. Established in 2010 and later acquired by Sinch, the platform offers an API for developers to integrate email sending capabilities directly into applications. This allows for automated delivery of emails such as account verifications, password resets, and shipping notifications, which are critical for user experience and operational workflows. The platform emphasizes high deliverability rates and scalability to support varying email volumes, from small startups to large enterprises.

For marketing teams, Mailjet includes tools for designing email campaigns, managing contact lists, and analyzing campaign performance. This dual functionality allows organizations to consolidate their email strategy onto a single platform. The service is suitable for developers seeking to embed email functionality with SDKs in languages like PHP, Python, and Node.js, as well as for technical buyers evaluating email infrastructure that meets compliance standards such as GDPR, ISO 27001, and SOC 2 Type II. Its focus on developer experience is evident through comprehensive API documentation and examples provided for integration efforts.

Mailjet's infrastructure is built to handle significant email traffic, which is a consideration for applications with a global user base or those experiencing rapid growth. The platform's ability to segment audiences, A/B test email content, and track metrics like open rates and click-through rates supports data-driven marketing decisions. Additionally, features like email template builders aim to streamline the creation process for both technical and non-technical users, ensuring brand consistency across different email types.

The platform's emphasis on security and compliance is designed to address concerns regarding data protection and regulatory requirements, particularly for businesses operating in regions with strict data privacy laws. By offering certifications like ISO 27001, Mailjet aims to provide assurance about its information security management systems. This makes it a consideration for companies in regulated industries or those handling sensitive user data. For a broader perspective on email service providers, a comparison of features and deliverability metrics across different platforms can be found in industry analyses, such as those that evaluate Mailgun's email deliverability and features.

Key features

• Transactional Email API: Enables programmatic sending of automated, event-triggered emails such as account confirmations, password resets, and notifications through a RESTful API with support for various programming languages Mailjet API documentation.
• Email Marketing Platform: Provides tools for creating, segmenting, sending, and tracking email marketing campaigns, including a drag-and-drop email builder and A/B testing capabilities.
• Email Template Builder: Offers a visual editor to design responsive email templates without coding, facilitating consistent branding and efficient content creation.
• Email Deliverability Services: Focuses on optimizing email delivery rates through features like dedicated IP addresses, sender authentication (SPF, DKIM, DMARC), and reputation management.
• Real-time Analytics: Offers dashboards and reports to monitor email performance metrics, including open rates, click-through rates, bounce rates, and unsubscribes, for both transactional and marketing emails.
• Contact Management: Functionality to manage subscriber lists, segment audiences based on various criteria, and handle unsubscribes automatically.
• Multi-language SDKs: Provides client libraries for popular programming languages including PHP, Python, Ruby, Node.js, Java, and Go to simplify API integration Mailjet developer guides.
• Security and Compliance: Adheres to data protection standards such as GDPR, ISO 27001, and SOC 2 Type II, addressing privacy and security requirements for sensitive email communications.

Pricing

Mailjet offers a free tier and tiered paid plans that scale with email volume and included features. Pricing details are current as of May 2026.

Additional email volumes beyond plan limits are typically charged per 1,000 emails. Specific pricing for higher volumes and custom enterprise solutions are available upon request through the vendor's Mailjet pricing page.

Common integrations

• CRM Platforms: Integrates with platforms like Salesforce to synchronize contact data and trigger personalized emails based on CRM events Mailjet Salesforce integration guide.
• E-commerce Platforms: Connects with platforms such as Shopify and WooCommerce to send order confirmations, shipping updates, and cart abandonment emails.
• CMS Systems: Plugins for content management systems like WordPress allow for email list building and automated content distribution.
• Marketing Automation Tools: Integrates with various marketing automation systems to enhance email campaign workflows and lead nurturing.
• Analytics Tools: Data can be exported or linked to external analytics platforms for deeper insights into email performance.

Alternatives

• SendGrid: A widely used email platform offering similar transactional and marketing email services, known for its extensive API and deliverability features.
• Mailgun: Primarily focused on transactional email for developers, providing robust APIs, SMTP relay, and email parsing capabilities.
• Postmark: Specializes in transactional email delivery, emphasizing speed, reliability, and clear analytics for application-generated emails.
• Amazon Simple Email Service (SES): A cost-effective, highly scalable email sending service offered by AWS, catering to both transactional and marketing email needs.
• SparkPost: An enterprise-grade email sending and analytics platform that focuses on high-volume senders and advanced deliverability tools.

Getting started

To send an email using Mailjet's API, you typically make an HTTP POST request to their send endpoint. The following example demonstrates how to send a basic email using cURL, specifying the sender, recipient, subject, and content. You will need your Mailjet API Key and Secret Key, which can be found in your Mailjet account dashboard.

curl -s \ 
  -X POST \ 
  --user "YOUR_API_KEY:YOUR_SECRET_KEY" \ 
  https://api.mailjet.com/v3.1/send \ 
  -H 'Content-Type: application/json' \ 
  -d '{ 
    "Messages":[ 
      { 
        "From":{ 
          "Email":"[email protected]", 
          "Name":"Mailjet Sender" 
        }, 
        "To":[ 
          { 
            "Email":"[email protected]", 
            "Name" : "Mailjet Recipient" 
          } 
        ], 
        "Subject":"Your first Mailjet email!", 
        "TextPart":"Greetings from Mailjet! This is your first transactional email.", 
        "HTMLPart":"<h3>Greetings from Mailjet!</h3><p>This is your first transactional email using Mailjet.</p>" 
      } 
    ] 
  }'

This cURL command sends an email with both plain text and HTML content. Replace YOUR_API_KEY, YOUR_SECRET_KEY, [email protected], and [email protected] with your actual credentials and desired email addresses. For more complex functionalities, such as adding attachments, custom headers, or using templates, refer to the Mailjet Send API v3.1 reference for detailed instructions and additional parameters.