Maileon SMTP and Email API: elevate your email game
Ensure your emails hit the inbox every time with Maileon SMTP or email API. Our service offers reliable delivery, robust security, and seamless integration to enhance your transactional email processes.
What is SMTP?
SMTP is a powerful tool that enables automated, triggered emails for critical customer actions—think password resets, order confirmations, and notifications. It’s essential to ensure your most important messages arrive quickly and reliably, boosting customer experience and building trust.
What is Maileon SMTP?
Maileon SMTP is a secure, reliable, and scalable solution designed for sending transactional emails with top-notch deliverability. Built on robust cloud infrastructure, our SMTP goes beyond the basics: you get advanced security, real-time analytics, and seamless integration with your existing marketing tools. Unlike standard email protocols, Maileon gives you transparent control, so your emails are delivered fast, efficiently, and in line with all industry-standard authentication measures.
What is Maileon Email API?
Maileon Email API (or SMTP via API) is the modern way to send, receive, and manage emails directly from your app or website—no manual work required. Traditionally, emails are sent using SMTP, which works a bit like the digital postal service. But with our Email API, you interact through a simple interface: just send your email content as a request, and the Email API handles the technical details behind the scenes.
This approach is faster, more reliable, and offers better tracking and analytics. It’s perfect for businesses that want to send large volumes of emails efficiently, without the technical headaches of old-school email delivery. Plus, you still get all the benefits of Maileon’s security, deliverability, and integration—just in a more flexible, developer-friendly package.

Transparent pricing
We believe in clear, competitive pricing that scales with your business. Maileon SMTP is available through a flexible, usage-based pricing model. Our pricing plans are designed to fit startups and large enterprises alike, ensuring you only pay for what you use. For an estimation, check out our pricing chart or for a more exact estimation speak directly with our sales team.
Features and benefits
Frequently asked questions
Our SMTP uses SMTP(S) with TLS encryption to ensure secure message transmission. It integrates support for SPF, DKIM, and DMARC, maintaining a high sender reputation. The service is compatible with popular CRM systems and marketing platforms, offering both API and direct SMTP options for a custom setup tailored to your technical requirements. Built on a resilient cloud-based infrastructure, it is optimised for high throughput and low latency, ensuring rapid email delivery.
We pride ourselves on offering comprehensive support and documentation. Our dedicated customer support team is available via email, and phone to assist with any technical queries or setup challenges. Additionally, our extensive documentation includes detailed guides, configuration manuals, and a robust FAQ section to help you troubleshoot quickly and efficiently.
Transactional emails are automated messages triggered by user actions, such as registration or purchase confirmation. They play a vital role in enhancing customer experience, building trust, and delivering critical information promptly.
This service is specifically designed for transactional emails only. For marketing campaigns, we recommend using our dedicated email marketing automation platform.
We employ sophisticated techniques to filter out artificial opens caused by iOS 15 Mail Privacy Protection and similar bots. While our detection methods are continuously enhanced, no system can guarantee 100% accuracy in filtering automated opens.
Maileon SMTP is the classic way to send emails using the Simple Mail Transfer Protocol, which means you connect your system (like your website or app) directly to Maileon’s mail servers using standard SMTP settings—just like you’d do with Gmail or Outlook. This method is super compatible and easy to set up, especially if you already have software that supports SMTP out of the box.
On the other hand, SMTP via API refers to sending emails through Maileon’s modern API interface, where you don’t have to deal with the technical details of the SMTP protocol itself. Instead, you send your email data to Maileon using a simple API call (usually REST), and Maileon handles the delivery for you—often still using SMTP behind the scenes, but you don’t have to worry about it.
In short: Maileon SMTP is the traditional, plug-and-play way to send emails, while SMTP via API is the smarter, more flexible option for businesses that want more control and insight.
Maileon’s SMTP Relay enables advanced personalization with X-Substitution-Data and templating for dynamic content. Engagement is tracked via X-Track-Opens and X-Track-Clicks, while X-Custom-Id ensures traceable messaging. Add X-Url-Tags to append UTM parameters (e.g., utm_source=email) to all links, supporting campaign attribution. These features provide robust analytics through Maileon’s tracking endpoints, helping monitor delivery, engagement, and performance across critical transactional emails.

Transform your transactional email communication
Experience the reliability and power of Maileon SMTP for your transactional emails. Get in touch to discuss your requirements and get started with a solution tailored to your business.