Mailgun

About Mailgun

Mailgun is a transactional email delivery platform and API service for developers, providing infrastructure to send, receive, track, and parse email at scale. The platform includes tools for email validation (via API or bulk list upload), email optimization for deliverability, and email preview/testing before campaigns launch, along with SMTP relay support.

The service is aimed at developers and businesses that need to integrate email sending into their own systems or connect email data to a CRM, ranging from smaller senders to high-volume enterprise use cases. Mailgun states it is used by over 150,000 businesses, including companies such as Lyft, Microsoft, Dribbble, Wikipedia, and American Express.

A free tier is available allowing up to 100 emails per day. Additional offerings include enterprise consulting, SAML authentication, and quality-assurance email testing tools built on the Email on Acid product.

Key features

• Send Email API and SMTP relay for transactional email delivery
• Email deliverability optimization tools to boost inbox placement and engagement
• Real-time Email Validation API and bulk list upload for cleaning email lists
• Email inbox preview and testing tools to catch rendering and accessibility issues before sending
• Incoming email parsing for connecting email data to CRMs and other systems
• Scales from thousands to millions of emails sent

Frequently asked questions