mailgun.js

import formData from 'form-data'
import Mailgun from 'mailgun.js'


const DOMAIN = 'mg.example.com'
const USERNAME = 'api'

const mailgun = new Mailgun(formData)
const client = mailgun.client({ username: USERNAME, key: process.env.MAILGUN_API_KEY, url: 'https://api.eu.mailgun.net' })

exports.handler = async function (event, context) {
  try {

    // Test that is POST
    if (event.httpMethod !== 'POST') {
      return { statusCode: 405, body: 'Method Not Allowed', headers: { Allow: 'POST' } }
    }

    // Get sent json
    const { html, toAddress } = JSON.parse(event.body)

    const messageData = {
      from: 'example bot <info@example.com>',
      to: toAddress || 'your@email.com',
      subject: `example test ${Date.now()}`,
      text: 'Testing the newsletter',
      html
    }

    const messagSentStatus = await client.messages
      .create(DOMAIN, messageData)
      .catch((err) => console.error(err))


    return {
      statusCode: 200,
      body: JSON.stringify({ messagSentStatus }),
    }

  } catch (error) {
    console.error(error)
     return {
       statusCode: 500,
       body: JSON.stringify({ error }),
     }
  }
}