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Alex Spinov
Alex Spinov

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Mailgun Has a Free Email API — Send Transactional Emails Without Managing SMTP Servers

#mailgun #email #api #webdev

Mailgun Has a Free Email API — Send Transactional Emails Without Managing SMTP Servers

Setting up your own email server is a nightmare — SPF, DKIM, DMARC, IP reputation, bounce handling, spam filters. Mailgun handles all of this with a single API call.

Mailgun is an email delivery service built for developers. Send transactional emails through their REST API or SMTP relay.

Why Developers Choose Mailgun

  • REST API — send emails with a simple POST request
  • SMTP relay — drop-in replacement for any SMTP client
  • Email validation — verify addresses before sending
  • Webhooks — track opens, clicks, bounces in real-time
  • Templates — Handlebars-based email templates
  • Routing — receive and parse inbound emails programmatically

Free Tier (Flex Plan)

  • 1,000 emails/month for 3 months
  • Email validation API (100 free validations)
  • All API features included
  • Webhooks and tracking

Quick Start: Send an Email 

const Mailgun = require('mailgun.js');
const formData = require('form-data');

const mg = new Mailgun(formData).client({
  username: 'api',
  key: 'your-api-key'
});

const result = await mg.messages.create('yourdomain.com', {
  from: 'Your App <noreply@yourdomain.com>',
  to: ['user@example.com'],
  subject: 'Welcome to Our Platform!',
  html: '<h1>Welcome!</h1><p>Thanks for signing up.</p>'
});

console.log(result); // { id: '<message-id>', message: 'Queued' }
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Webhook Events 

app.post('/webhooks/mailgun', (req, res) => {
  const event = req.body['event-data'];
  switch (event.event) {
    case 'delivered': console.log('Delivered to ' + event.recipient); break;
    case 'opened': console.log('Opened by ' + event.recipient); break;
    case 'clicked': console.log('Link clicked: ' + event.url); break;
    case 'failed': console.log('Failed: ' + event['delivery-status'].message); break;
  }
  res.sendStatus(200);
});
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Email Validation 

const validation = await mg.validate.get('user@example.com');
if (validation.result === 'deliverable') {
  // Safe to send
} else if (validation.result === 'undeliverable') {
  // Bad address — don't send
}
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The Bottom Line

Mailgun removes the operational burden of email delivery. Focus on your product, not email infrastructure.

Need to extract email addresses from websites, validate contact lists, or monitor deliverability? I build custom data extraction tools.

📧 Email me: spinov001@gmail.com
🔧 My tools: Apify Store

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