Mailgun is a full-featured email delivery and tracking service aimed at developers and organizations that send automated or transactional mail. It provides a complete REST API, SMTP relay, and analytics suite for managing email at scale. Mailgun supports both sending and receiving mail through webhooks, with features for domain reputation management, validation, and deliverability optimization. It is used for large-scale transactional messages, such as sign-up confirmations, password resets, and newsletters. Typical features include - Full email send and receive API - SMTP and HTTP endpoints - Logging, analytics, and message tracking - Dedicated IP addresses for better reputation - Validation and inbox placement tools - Scalable infrastructure for high volumes Pricing begins around fifteen dollars per month for low-volume plans and scales based on the number of emails sent. The free plan allows roughly one hundred emails per day, mainly for testing. Mailgun is most suitable for developers who need to send email programmatically from apps or servers and want insight into deliverability and performance.