SparkPost

One of the largest cloud email delivery providers globally, known for high deliverability and developer-friendly APIs, now operating under MessageBird/Bird

SparkPost is a cloud-based email delivery platform that provides businesses with the infrastructure and tools needed to send transactional and marketing emails reliably at scale. Originally launched as the developer-focused email service from Message Systems (the makers of the Momentum MTA), SparkPost has grown to become one of the world's largest email senders, processing hundreds of billions of emails per month for thousands of customers globally. The platform is particularly well-regarded for its deliverability rates, real-time analytics, and robust REST API that makes it easy for developers to integrate email sending into applications. SparkPost's core offering centers on its Email Delivery API, which gives developers programmatic access to send emails with detailed tracking and analytics. The platform also offers features like predictive email intelligence, recipient validation, A/B testing, and advanced deliverability tools. Its infrastructure is built on top of the same Momentum MTA technology used by many of the world's largest ISPs and email senders, giving it a strong technical foundation and credibility in the enterprise market. In 2021, SparkPost was acquired by MessageBird, a global cloud communications platform, as part of MessageBird's strategy to build a comprehensive omnichannel communications suite. Under MessageBird (which later rebranded to Bird), SparkPost continues to operate as a key component of the email channel offering. SparkPost competes with services like SendGrid (Twilio), Mailgun (Sinch), Amazon SES, and Postmark, and is particularly favored by enterprise customers and developers who prioritize deliverability performance and detailed analytics.