Sending Transactional Email with MailChannels: A Complete Guide If you’re building an application or running a service that sends real-time email messages, like password resets, order confirmations, or signup verifications, transactional email is your best friend. And when it comes to reliable, secure, and high-deliverability infrastructure, MailChannels is a top choice. This guide will walk you through everything you need to know to get started with sending transactional email through MailChannels, whether you’re using SMTP relay or integrating with our API. What Is Transactional Email? Before we dive into setup, let’s clarify: transactional emails are messages triggered by user actions or system events. These are not marketing emails. They’re essential communications your users expect. Explore the difference: What Is Transactional Email? (vs Marketing Email) 1. How to Send Transactional Email via SMTP Relay For many developers, SMTP is the simplest way to get started. It allows you to route transactional messages through MailChannels using your preferred mail client or library. Learn more: How to Send Transactional Email via SMTP Relay 2. How to Integrate the MailChannels Email API Looking for more control, speed, and visibility into your email delivery? Our HTTP-based API is designed for developers who want a programmatic, scalable way to send email. This tutorial includes real code examples to help you get started quickly: How to Integrate the MailChannels Email API (with code examples) 3. Choosing Between SMTP and API: What’s Right for You? Not sure whether to use SMTP or API? Each method has its advantages depending on your stack and needs. Get the full breakdown: SMTP vs API: Which Should You Use? 4. Comparing MailChannels with Other Providers If you’re evaluating email infrastructure, you might be comparing us with providers like SendGrid, Postmark, or Mailgun. We break down the key differences—especially around deliverability, cost efficiency, and abuse prevention. See the comparison: MailChannels vs SendGrid / Postmark / Mailgun 5. Troubleshooting MailChannels Setup Issues Running into issues during setup? This resource covers the most common pitfalls—like DNS misconfigurations or blocked ports—and how to resolve them. Fix common issues: Troubleshooting Common MailChannels Setup Errors 6. Best Practices for IP Warmup If you’re sending from a new IP or domain, warming up your sending reputation is essential for inbox placement. This is especially important for transactional volume increases. Learn the steps: IP Warmup for Transactional Email Using MailChannels Final Thoughts MailChannels makes it easy to deliver transactional emails reliably, securely, and at scale. Whether you’re sending login links or shipping confirmations, we’re built to keep your messages out of the spam folder—and in front of your users. Want to get started today? Explore the MailChannels Transactional Email API and build with confidence.