Node Cookbook - Third Edition

How to do it...

Let's start by requiring the relevant dependencies:

const fs = require('fs') const path = require('path') const smtp = require('smtp-protocol') 

We're only going to accept emails to certain host domains, and only for certain users. We also need somewhere to store the emails we have accepted.

So let's create two whitelist sets, one for hosts and the other for users, along with a target path for mailboxes:

const hosts = new Set(['localhost', 'example.com']) const users = new Set(['you', 'another']) const mailDir = path.join(__dirname, 'mail') 

Before we create the server, we have some setup to perform. We need to make sure that the mail directory and user mailboxes exist on the filesystem. If they don't, we need to create them. ...