const MailDev = require('maildev') // must run maildev as forked ChildProcess // failed instantiation stops main process with exit code 0 process.on('message', (msg) => { if (msg.start) { const maildev = new MailDev({ ip: '127.0.0.1', smtp: 1025, disableWeb: true, silent: true }) maildev.on('new', email => { process.send({ email }) }) maildev.listen(err => { if (err) { // cannot send as Error object return process.send({ err: err.message }) } return process.send({ err: null }) }) } })