Mailgun

Mailgun, now operating as Sinch Email, is a leading email delivery service and API platform for developers, enabling businesses to send, track, test, and optimize transactional and marketing emails at scale. Acquired by Sinch in 2021, the platform serves over 150,000 businesses including 8 of the 10 largest technology companies in the world, with customers spanning Lyft, Microsoft, Dribbble, Wikipedia, NHL, American Express, and Substack. The platform has analyzed over 400 billion emails to generate its industry Email Impact Report, based on surveys of 1,200-plus senders. Core capabilities include high-throughput SMTP and REST API email sending with intelligent routing and global infrastructure, real-time analytics and event webhooks for delivery, opens, clicks, bounces, and spam complaints, email validation API that verifies address validity before sending to reduce bounce rates, inbox placement testing to preview rendering across 90-plus email clients, and email optimization tools with machine learning-based send time optimization and A/B testing. A Forrester Total Economic Impact study documented 21 percent decreased bounce rates, 65 percent increased open rates, and 100 percent increased click rates among enterprise customers. The platform offers dedicated IP addresses, automated domain authentication with SPF, DKIM, and DMARC, managed deliverability services with dedicated IP warm-up, and compliance with ISO standards, Cloud Security Alliance requirements, and GDPR. Developer SDKs cover Python, Ruby, PHP, Node.js, Go, Java, and .NET. The free tier includes 100 emails per day with pay-as-you-go scaling for higher volumes. Enterprise plans include managed services, dedicated infrastructure, and white-glove deliverability consulting with expert inbox placement guidance.