Over 150,000 companies are building great apps and email programs with Mailgun
Flexible email sending: Limitless capacity
Emails are unique, and so are the email programs that send them. Mailgun's easy-to-use email service enables businesses large and small to send at scale via their preferred method of sending. Whether it's SMTP Relay or RESTful API, Mailgun can handle tens, thousands – millions of emails a second with ease.
Get expert guidance on your email strategy
We'd love to get an understanding of how email fits into your business and what challenges you're facing. Send us your details and we'll get in contact to determine your best Mailgun Send configuration.
Rapid Fire Delivery SLA
Guaranteed 99% attempted delivery of up to 15 million messages within the first five minutes of sending.
Rapid Fire Throughput SLA
Up to 72 million message requests an hour (1.2 million requests a minute).
Email Validation SLA
Customers utilizing the single verifications API method are guaranteed to receive a response from the email service within 200ms of receiving the request for 95% of any given monthly volume.
Support Response Time SLAs
Variable, guaranteed response time frames and communication methods.
Email delivery SLAs you can rely on
Our Service Level Agreements (SLAs) are more than promises where you sign the dotted line. They are financial commitments to deliver the desired level of performance without fail to you – every day:
Email data with depth
Understand every detail of what happened with your email with Mailgun API’s log retention and email analytics. From the moment you press send, our platform can track:
Email events like addition to the message queue, MBP acceptance, and delivery
Error codes with exact time stamps and explanations
Engagement metrics like opens, clicks, unsubscribes, and more
98% average email delivery rate
From deliverability services customers, beating the industry average of 85%.
24.6m average monthly volume
From our deliverability services customers alone.
0.42% average bounce rate
For deliverability services customers, well under the industry average bounce rate of 2%.
Automate email processing with inbound routes
Spend less time parsing through your incoming email streams with Mailgun’s Inbound Routes. Routes allow senders to clean up cluttered email threads by fully parsing your inbound messages and converting them to UTF-8 for easy reading.
Mailgun Send Product Features
Email API
Our RESTful email API helps businesses programmatically send, receive, and track emails at scale, ensuring efficient communication and seamless workflow integration.
SMTP Relays
Mailgun's SMTP relays eliminate the need for legacy senders to host their own server, simplifying the process and reducing costs for consistent email delivery.
Email Routing
Route and parse incoming email streams in UTF-8 JSON for easier integration into systems, using an MTA designed for high-volume email delivery, streamlining data processing.
Email Event Webhooks
Push email campaign data to other apps for cross-team insights, enabling real-time, data-driven decisions to improve email performance.
Send Time Optimization
Send email campaigns when recipients are most likely to engage – boosting visibility, increasing engagement, and maximizing impact.
Email Protection
Email authentication and TLS encryption secure email transmission, protecting sensitive data and ensuring compliance.
Easy API Integration
Mailgun's APIs and SMTP relays are designed for seamless integration with your existing applications and workflows. Our comprehensive documentation and SDKs make it easy to get started.
Email Logs
Maintain a comprehensive record of all your email activity with detailed email logs. Track every sent, received, bounced, or dropped email with timestamps and detailed information.
Email Analytics
Analyze key metrics like open rates, click-through rates, bounces, and unsubscribes to measure campaign performance and identify areas for improvement.
Send email for yourself, your customers, or both
Each domain within Mailgun is an isolated sub-account with its own sending queue and reputation. That means that your transactional emails won’t get stuck behind your newsletters. It also means you can effectively manage thousands of your own customers all within a single Mailgun account. Is one of your customers spamming? We can disable their domain without affecting your good customers.
Batch sending
With a single API call, you can send up to 1000 fully personalized emails. Mailgun will properly assemble the MIME message and send the email to each of your users individually. That makes sending large volumes of email a lot faster and a lot less resource intensive.
Custom email handling with SMTP API
Simple mail transfer protocol (SMTP) is a fast, easy way to send email messages from one mail server to another.
When you use a personal email address to send bulk marketing campaigns or transactional emails to a lengthy contact list, you can bump up against send rate limits, get flagged as spam, or have to awkwardly blind carbon copy your mailing list on every email message.
In that case, SMTP relay, in which a third party sends email to multiple recipients over its own mail servers, may make sense. The sender address is the same and the email content is absolutely secure, but by sending the marketing or transactional email through a partner’s server, you can increase your email delivery rate without the hassle, costs, or security concerns associated with maintaining your own mail server. It’s a lot better than trying to push everything through a consumer email address, such as Google’s gmail.
Cloud-based SMTP relay isn’t the only option for sending email to multiple recipients without getting an error message or having to read the fine print of your account details. You can also use an SMTP API. Anyone with an API overview under their belt knows that APIs – which allow two applications to talk to each other – can be both powerful and customizable.
Free email sending service
Whether you want to set up transactional emails or send a bulk campaign to your entire mailing list, the hard part of sending email is all the stuff that happens behind the scenes. That’s where Mailgun comes in as your free email sending service.
Explore beyond email sending services
Mailgun has a variety of features for companies in need of a free email sending service.
"Mailgun makes it easy to build and manage a large-scale email marketing application with thousands of customers sending millions of emails."
Chris Hexton
CEO & Co-Founder, Vero