Update sample

.gitignore

@@ -2,3 +2,4 @@ node_modules
 .idea
 .DS_Store
 .vscode
+application/config.js

application/config.sample.js

@@ -0,0 +1,51 @@
+// Note: Also update app.json and README.md!
+
+const config = {
+	email: {
+		domains: process.env.EMAIL_DOMAINS,
+		deleteMailsOlderThanDays: process.env.EMAIL_DELETE_MAILS_OLDER_THAN_DAYS || 2
+	},
+	imap: {
+		user: process.env.IMAP_USER,
+		password: process.env.IMAP_PASSWORD,
+		host: process.env.IMAP_SERVER,
+		port: process.env.IMAP_PORT || 993,
+		tls: process.env.IMAP_TLS || true,
+		authTimeout: process.env.IMAP_AUTHTIMEOUT || 3000,
+		refreshIntervalSeconds: process.env.IMAP_REFRESH_INTERVAL_SECONDS || 10
+	},
+	http: {
+		port: normalizePort(process.env.HTTP_PORT || '3000'),
+		branding: process.env.HTTP_BRANDING || ["48hr.email", "CrazyCo", "https://crazyco.xyz"]
+	},
+}
+
+if (!config.imap.user || !config.imap.password || !config.imap.host) {
+	throw new Error('IMAP is not configured. Use IMAP_* ENV vars.')
+}
+
+if (!config.email.domains) {
+	throw new Error('DOMAINS is not configured. Use ENV vars.')
+}
+
+/**
+ * Normalize a port into a number, string, or false.
+ */
+
+function normalizePort(val) {
+	const port = parseInt(val, 10)
+
+	if (isNaN(port)) {
+		// Named pipe
+		return val
+	}
+
+	if (port >= 0) {
+		// Port number
+		return port
+	}
+
+	return false
+}
+
+module.exports = config;