Mailjet

Email API and marketing platform that unifies transactional and marketing email in one service. Supports both programmatic sending via REST API or SMTP relay and visual campaign design, with shared analytics and contact management across both use cases.

Trusted by over 100,000 businesses, including Lyft, Microsoft, DHL, and Kajabi. Part of Sinch. Differentiates by combining transactional and marketing email in a single API instead of requiring separate providers. Built-in GDPR compliance, ISO 27001 and SOC 2 certifications, and EU-based data centers for regional data residency. Official SDKs for PHP, Ruby, Python, C#, Java, and Node.js.

Key capabilities:

• REST API and SMTP relay for programmatic sending with reliable delivery and 99.9% uptime SLA
• Real-time event webhooks for delivery, opens, clicks, and bounces
• Drag-and-drop email editor with templates, AI-assisted generation, and responsive design
• Dynamic template rendering and server-side personalization at scale
• Inbound Parse API to process incoming emails and automate workflows
• Segmentation, automation builder, and A/B testing for marketing campaigns

Developers integrate Mailjet for transactional emails such as password resets, order confirmations, and lifecycle notifications. Marketing teams use the visual editor for newsletters and campaigns. Teams consolidate email tooling into one platform to simplify integrations, reduce vendor overhead, and manage logs and templates in a single place.