Transactional Email API - Developer-First Email Infrastructure | SMASHSEND

[ ![SMASHSEND email marketing - The #1 Email Marketing Tool that turns emails into revenue](https://smashsend.com/_next/static/media/smashsend_dark.da05b6ec.svg) ![SMASHSEND email marketing - The #1 Email Marketing Tool that turns emails into revenue](https://smashsend.com/_next/static/media/smashsend_dark.da05b6ec.svg) ](https://smashsend.com/) Features Integrations & API Resources 1.  [        Home        ](https://smashsend.com/) / 3.  [        Transactional Email API        ](https://smashsend.com/transactional-email-api) ## Transactional emails your users actually get Developer-first email API that delivers critical emails in milliseconds, not minutes. Built for reliability, speed, and scale. 100k emails/month free · No credit card terminal — @smashsend/node ```$ npm install @smashsend/node ✓ Installed in 1.2s const smashsend = new SmashSend('your-api-key'); await smashsend.emails.send({  to: 'user@example.com',  subject: 'Welcome!',  html: '<h1>Hello World</h1>'}); ✓ Email delivered in 47ms``` ## Built for speed & reliability When your business depends on email delivery, you need infrastructure you can trust. That's why leading companies rely on SMASHSEND. 30M+ Emails sent 12M+ Contacts 99% Delivery rate ## Simple API, powerful features ### RESTful API Clean, intuitive API design with comprehensive documentation. SDKs available for Node.js, Python, Ruby, PHP, Go, and more. ### Real-time webhooks Get instant notifications for opens, clicks, bounces, and spam reports. Build reactive workflows with reliable webhook delivery. ### Enterprise security SOC 2 Type II certified. End-to-end encryption, dedicated IPs, and custom domains. GDPR and CCPA compliant. ### Smart delivery Automatic retry logic, bounce handling, and reputation monitoring. We optimize delivery so you don't have to. ### Batch sending Send to thousands of recipients with a single API call. Automatic throttling and queue management included. ### Template engine Store and version your email templates. Use variables, conditionals, and loops with our powerful templating language. ## Start sending in minutes Our API is designed to get you up and running fast. Choose your language and start sending. ```const smashsend = require('smashsend');const client = smashsend('YOUR_API_KEY'); // Send a transactional emailawait client.emails.send({  to: 'customer@example.com',  from: 'your-app@yourdomain.com',  subject: 'Welcome to Our Platform!',  html: '<h1>Thanks for signing up!</h1>',  text: 'Thanks for signing up!'});``` ## Perfect for every use case E-commerce ### Every step of the order Order confirmations, shipping notifications, cart abandonment, and review requests. Authentication ### The emails users wait for Welcome emails, password resets, 2FA codes, and account verification. SaaS platforms ### Keep accounts informed Usage alerts, invoice emails, team invitations, and trial expiration notices. ## Advanced features for scale As you grow, SMASHSEND grows with you. Enterprise features available from day one, no upgrades needed. ### Automatic retries Failed deliveries are automatically retried with exponential backoff. Our smart retry logic ensures maximum deliverability without overwhelming recipient servers. ### Detailed analytics Track every email with real-time analytics. Monitor delivery rates, open rates, click-through rates, and more. Export data or use our webhook API for custom analytics. ### Global infrastructure Send from data centers worldwide for optimal delivery speed. Automatic geo-routing ensures your emails reach recipients fast, wherever they are. ### Spam protection Built-in spam detection and prevention. We monitor your reputation and provide feedback to ensure your emails reach the inbox, not spam. ## Trusted by developers worldwide “SMASHSEND's API is exactly what we needed. Clean, fast, and reliable. We migrated in a day and haven't looked back.” — Alex Chen, CTO at TechStartup -   **50% faster** API response times than legacy providers-   **3x better** deliverability than commodity relays-   **60% cheaper** than raw cloud sending, with support included ## Complete email platform Need more than transactional emails? SMASHSEND has you covered. ## Start sending in 5 minutes Get started with our lightning-fast transactional email infrastructure. No credit card required • 99% uptime SLA