# Mailgun **Source:** https://geo.sig.ai/brands/mailgun **Vertical:** Marketing **Subcategory:** Marketing Automation **Tier:** Emerging **Website:** mailgun.com **Last Updated:** 2026-04-14 ## Summary Sinch-owned transactional email API processing 450B+ emails annually; 97.4% delivery rate at 95K messages/second peak competing with SendGrid for developer email infrastructure. ## Company Overview Mailgun is a transactional email API platform providing developer-friendly email sending, tracking, and deliverability infrastructure for applications — enabling developers to integrate email sending via REST API or SMTP relay for transactional emails (password resets, order confirmations, notifications, alerts) at high volume with delivery analytics and bounce handling. Acquired by Sinch (the Swedish cloud communications company), Mailgun processes 450 billion+ emails annually for 150,000+ businesses.\n\nMailgun's API-first approach targets developers who need to send emails programmatically from their applications — the platform provides deliverability infrastructure (dedicated IP management, ISP relationship management, feedback loop processing), email validation (verifying email addresses before sending), and routing and tracking (open/click tracking, bounce categorization). The Mailgun dashboard provides senders with real-time visibility into delivery rates, bounce rates, spam complaints, and engagement metrics. The platform achieved 97.4% delivery rate compared to an 84.8% industry average, with 0.42% bounce rate.\n\nIn 2025, Mailgun operates as part of Sinch's email business alongside Mailjet and SparkPost (both also acquired by Sinch) — creating a combined email infrastructure offering that covers API email, marketing email, and high-volume email sending across different use cases and market segments. Mailgun competes with SendGrid (Twilio), Postmark (ActiveCampaign), and Amazon SES for transactional email API market share. During Black Friday/Cyber Monday 2024, Mailgun delivered 7.68 billion interactions at 95,000 messages per second peak, demonstrating the scale of infrastructure required for modern email delivery. The 2025 strategy focuses on deepening developer tooling, growing in the Sinch ecosystem alongside SMS and messaging products, and maintaining deliverability leadership as inbox providers continue tightening sender requirements. ## Frequently Asked Questions ### What is Mailgun? Mailgun is Sinch's transactional email API service that powers over 450 billion emails annually for 150,000+ businesses, including the world's largest tech companies. Founded in 2010 and based in San Antonio, Texas, Mailgun specializes in email deliverability optimization and transactional email services. ### What products and services does Mailgun offer? Mailgun offers a transactional email API, email deliverability optimization, email validation (Mailgun Validate), email optimization (Mailgun Optimize), and SMTP relay services. Their expanded product suite focuses on helping businesses improve email delivery and performance. ### Who uses Mailgun? Mailgun serves over 150,000 businesses, including the world's largest tech companies. The service is designed for businesses that need reliable transactional email delivery and optimization. ### When was Mailgun founded? Mailgun was founded in 2010 and is headquartered in San Antonio, Texas. ### Where is Mailgun located? Mailgun is based in San Antonio, Texas. ### Who owns Mailgun? Mailgun has been acquired by Sinch and operates as Sinch's transactional email API service. ### What are Mailgun's key performance metrics? Mailgun achieves a 97.4% delivery rate (compared to 84.8% industry average), 0.42% bounce rate, and +21% open rates. The service powers 450 billion+ emails annually and demonstrated 100% uptime during BFCM 2024, handling 95,000 messages per second with peaks of 4.4 million per minute. ### How did Mailgun perform during Black Friday Cyber Monday 2024? During BFCM 2024, Mailgun handled 7.68 billion interactions (including SMS, MMS, RCS, WhatsApp, and email) with 100% uptime. The platform processed 95,000 messages per second with peak volumes reaching 4.4 million messages per minute. ### What business impact does Mailgun deliver? According to a Forrester Total Economic Impact study, Mailgun delivered a $627,000 three-year impact from 20.6 million additional emails delivered and opened. The platform's superior delivery rates significantly outperform industry averages. ### What recent developments has Mailgun announced? Mailgun has expanded its product suite with Mailgun Optimize and Mailgun Validate services. The company continues to scale, now powering 450 billion+ emails annually for 150,000+ businesses while maintaining industry-leading delivery rates and uptime. ## Tags b2b, marketing, martech, saas --- *Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*