Mailgun Connector

// HTTP Basic Auth format
const headers = {
  'Authorization': `Basic ${Buffer.from(
    `api:${process.env.MAILGUN_API_KEY}`
  ).toString('base64')}`
};

// Or using curl
// curl -s --user 'api:YOUR_API_KEY' ...

connectors:
  mailgun:
    enabled: true
    api_key: "${MAILGUN_API_KEY}"
    domain: "${MAILGUN_DOMAIN}"
    region: "us"  # or "eu" for EU region

    sync:
      events: true
      contacts: true
      bounces: true
      complaints: true
      schedule: "*/15 * * * *"  # Every 15 minutes

    webhook:
      signing_key: "${MAILGUN_WEBHOOK_SIGNING_KEY}"

    lists:
      engaged: 30
      bounced: 31
      complained: 32

field_mapping:
  email: email
  first_name: FIRSTNAME
  last_name: LASTNAME
  open_rate: MG_OPEN_RATE
  click_rate: MG_CLICK_RATE
  last_delivered: MG_LAST_DELIVERED
  bounce_type: MG_BOUNCE_TYPE
  engagement_score: MG_ENGAGEMENT
  unsubscribed: MG_UNSUBSCRIBED

import { TajoClient } from '@tajo/sdk';

const tajo = new TajoClient({
  apiKey: process.env.TAJO_API_KEY,
  brevoApiKey: process.env.BREVO_API_KEY
});

await tajo.connectors.connect('mailgun', {
  apiKey: process.env.MAILGUN_API_KEY,
  domain: process.env.MAILGUN_DOMAIN,
  region: 'us'
});

// Send an email using Mailgun's Messages API
const formData = new URLSearchParams();
formData.append('from', `Your App <noreply@${domain}>`);
formData.append('to', '[email protected]');
formData.append('subject', 'Welcome to our platform');
formData.append('html', '<h1>Welcome!</h1><p>Thanks for signing up.</p>');
formData.append('o:tag', 'welcome-email');
formData.append('o:tracking', 'yes');

const response = await fetch(
  `https://api.mailgun.net/v3/${domain}/messages`,
  {
    method: 'POST',
    headers: {
      'Authorization': `Basic ${Buffer.from(`api:${apiKey}`).toString('base64')}`
    },
    body: formData
  }
);

const result = await response.json();
// { id: '<[email protected]>', message: 'Queued. Thank you.' }

// Query Mailgun events and sync engagement data
const eventsResponse = await fetch(
  `https://api.mailgun.net/v3/${domain}/events?` +
    new URLSearchParams({
      begin: lastSyncDate,
      ascending: 'yes',
      limit: 300,
      event: 'delivered OR opened OR clicked'
    }),
  {
    headers: {
      'Authorization': `Basic ${Buffer.from(`api:${apiKey}`).toString('base64')}`
    }
  }
);

const { items, paging } = await eventsResponse.json();

for (const event of items) {
  const email = event.recipient;

  switch (event.event) {
    case 'delivered':
      await tajo.contacts.update(email, {
        attributes: { MG_LAST_DELIVERED: event.timestamp }
      });
      break;
    case 'opened':
      await tajo.events.track({
        email,
        event: 'email_opened',
        properties: { subject: event.message.headers.subject }
      });
      break;
    case 'clicked':
      await tajo.events.track({
        email,
        event: 'email_clicked',
        properties: { url: event.url }
      });
      break;
  }
}

// Follow pagination for more events
if (paging.next) {
  // Fetch next page using paging.next URL
}

const crypto = require('crypto');

app.post('/webhooks/mailgun', async (req, res) => {
  // Verify webhook signature
  const { timestamp, token, signature } = req.body.signature;
  const encodedToken = crypto
    .createHmac('sha256', process.env.MAILGUN_WEBHOOK_SIGNING_KEY)
    .update(timestamp.concat(token))
    .digest('hex');

  if (encodedToken !== signature) {
    return res.status(401).send('Unauthorized');
  }

  const eventData = req.body['event-data'];
  const event = eventData.event;
  const email = eventData.recipient;

  await tajo.connectors.handleWebhook('mailgun', {
    topic: event,
    payload: eventData
  });

  // Handle bounce suppression
  if (event === 'failed' && eventData.severity === 'permanent') {
    await tajo.contacts.update(email, {
      attributes: { MG_BOUNCE_TYPE: 'hard_bounce' },
      emailBlacklisted: true
    });
  }

  res.status(200).send('OK');
});

// Sync bounced addresses for list hygiene
const bouncesResponse = await fetch(
  `https://api.mailgun.net/v3/${domain}/bounces?limit=100`,
  {
    headers: {
      'Authorization': `Basic ${Buffer.from(`api:${apiKey}`).toString('base64')}`
    }
  }
);

const { items: bounces } = await bouncesResponse.json();

for (const bounce of bounces) {
  await tajo.contacts.update(bounce.address, {
    attributes: {
      MG_BOUNCE_TYPE: bounce.error.includes('550') ? 'hard_bounce' : 'soft_bounce',
      MG_BOUNCE_DATE: bounce.created_at
    },
    emailBlacklisted: bounce.error.includes('550')
  });
}

connectors:
  mailgun:
    debug: true
    log_level: verbose
    log_webhooks: true
    log_events: true

graph LR
  Source["Mailgun API / repository"] --> Auth["Auth and scopes"]
  Source --> Objects["Objects, events, and schemas"]
  Auth --> Tajo["Tajo connector runtime"]
  Objects --> Tajo
  Tajo --> Brevo["Brevo contacts, attributes, lists, campaigns"]
  Tajo --> Ops["Backfill, cursor, retries, logs"]