Mailgun
by Sinch AB
Transactional email API from Sinch with SMTP relay, inbound routing, email validation, and deliverability analytics. Mailgun is a transactional email service originally founded in 2010 and acquired by Rackspace in 2012. Mailgun was spun out as an independent company in 2017 and acquired by Sinch AB in 2021 for approximately $273 million.
Key Facts
| Attribute | Value | As of | Source |
|---|---|---|---|
| Founded | 2010 (acquired by Sinch 2021 for $273M) | Apr 2026 | Sinch press release |
| Parent Company | Sinch AB (Nasdaq Stockholm: SINCH) | Apr 2026 | Sinch |
| Foundation | $15/month (Foundation, 10,000 emails) | Apr 2026 | Mailgun |
| Growth | $35/month (Growth, 50,000 emails) | Apr 2026 | Mailgun |
| Scale | $90/month (Scale, 100,000 emails) | Apr 2026 | Mailgun |
| Dedicated IP | Dedicated IP $60/month per IP (add-on) | Apr 2026 | Mailgun |
| Inbound Parsing | Inbound email parsing to webhook events | Apr 2026 | Mailgun |
| Validation API | Email validation API to reduce bounce rates | Apr 2026 | Mailgun |
About Mailgun
Mailgun is a transactional email service originally founded in 2010 and acquired by Rackspace in 2012. Mailgun was spun out as an independent company in 2017 and acquired by Sinch AB in 2021 for approximately $273 million. As of April 2026, Mailgun is a primary transactional email brand within the Sinch Mailgun Group, which also includes Mailjet.
The platform provides SMTP relay and REST API for sending transactional email (password resets, receipts, notifications), inbound email parsing (converting incoming messages to webhook events), email validation to reduce bounce rates, and detailed analytics on deliveries, opens, clicks, bounces, and complaints. Mailgun offers dedicated IPs on paid tiers, custom SPF and DKIM configuration, and suppression list management for compliance with unsubscribe and complaint handling.
Mailgun pricing is volume-based. The Foundation plan starts at $15/month for 10,000 emails, Growth at $35/month for 50,000 emails, Scale at $90/month for 100,000 emails, and custom pricing above 250,000 emails. All plans include the core send API, inbound routing, and basic analytics. Dedicated IP costs an extra $60/month per IP. Mailgun also offers a free trial of 100 emails/day for 30 days; there is no permanent free tier as of April 2026.
Mailgun integrates with Zapier, Make, Shopify, WordPress (SMTP plugins), and provides SDKs for Node.js, Python, Ruby, PHP, Go, Java, and .NET. The platform is commonly used as the email backend for SaaS applications and developer-facing tools.
Integrations (8)
Other Email Automation Tools
ActiveCampaign
Email marketing, marketing automation, and CRM tools you will actually use
Email AutomationConstant Contact
Email marketing platform since 1995 with drag-and-drop editor, automations, landing pages, and social media marketing.
Email AutomationConvertKit (Kit)
Creator-focused email marketing platform with visual automations, landing pages, and digital commerce features.
Email AutomationDrip
Ecommerce email and SMS marketing platform with visual workflows, revenue attribution, and deep Shopify integration.
Email AutomationSee How It Ranks
Best Email Automation Tools in 2026
A ranked list of the best email automation tools in 2026. This ranking evaluates platforms across deliverability, automation depth, template quality, analytics capabilities, and pricing value. The ranking includes transactional email APIs (SendGrid), ecommerce-focused platforms (Klaviyo), creator-oriented tools (ConvertKit), multi-channel marketing suites (Brevo, Customer.io), and the most widely adopted email platform (Mailchimp). Tools with fallback entries use ActiveCampaign where a primary tool slug is unavailable.
Best Marketing Automation Platforms 2026
Our definitive ranking of the best marketing automation platforms for 2026, scored on automation depth, deliverability, pricing value, and integration breadth.
Questions About Mailgun
How do you migrate from SendGrid to Resend in 2026?
A SendGrid-to-Resend migration in 2026 follows five steps: verify domains in Resend, port templates (Resend recommends React Email), swap the API client in code, run dual-send for a verification window, and update DNS to point all sending traffic to Resend. Most production migrations take 1-2 weeks end to end.
What does the Resend free tier include in 2026?
As of May 2026, the Resend free tier includes 3,000 emails/month, 100 emails/day, one verified domain, 30-day email log retention, and basic webhooks. The free tier is intended for development, testing, and very small production sends; teams typically upgrade to the $20/month Pro plan once they exceed 100 emails/day.
What's the difference between Resend, SendGrid, and Postmark?
Resend is a React-template developer-first email API from 2023 with 3,000 free emails/month and $20/month for 50K. SendGrid is the high-scale market leader from 2009 (Twilio) with marketing plus transactional from $19.95/month. Postmark is the deliverability specialist from 2010 (ActiveCampaign) for transactional-only at $15/month for 10K.
What are the best Mailgun alternatives in 2026?
As of April 2026, the leading Mailgun alternatives are SendGrid (Twilio-owned scale email API), Postmark (high-deliverability transactional email), Amazon SES (lowest-cost AWS-native option), Resend (developer-focused modern API), and Brevo (transactional plus marketing in one). Choice depends on volume, deliverability priorities, and integration with marketing tools.