Mailgun

A transactional email delivery service and API that enables developers to send, receive, and track emails reliably, solving the problem of integrating scalable email into applications. It sells to developers and engineering teams at startups, mid-market companies, and large enterprises. Positioned as a developer-friendly platform built by developers, it offers a comprehensive email suite including validation, optimization, and testing tools.

Key features

• Send transactional emails via API and SMTP
• Receive and track email delivery
• Email validation and list cleaning
• Email deliverability optimization
• Email template builder
• Email testing and preview
• Inbox placement monitoring
• Scalable infrastructure for high volumes