Initial commit

node_modules/smtp-server/examples/lmtp.js

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+/* eslint no-console: 0 */
+
+'use strict';
+
+// Replace '../lib/smtp-server' with 'smtp-server' when running this script outside this directory
+const SMTPServer = require('../lib/smtp-server').SMTPServer;
+
+const SERVER_PORT = 2524;
+const SERVER_HOST = '0.0.0.0';
+
+// Connect to this example server by running
+//   telnet localhost 2524
+// or
+//   nc -c localhost 2524
+
+// Setup server
+const server = new SMTPServer({
+    // log to console
+    logger: true,
+
+    lmtp: true,
+
+    // not required but nice-to-have
+    banner: 'Welcome to My Awesome LMTP Server',
+
+    // disable STARTTLS to allow authentication in clear text mode
+    disabledCommands: ['STARTTLS', 'AUTH'],
+
+    // Accept messages up to 10 MB
+    size: 10 * 1024 * 1024,
+
+    // Validate MAIL FROM envelope address. Example allows all addresses that do not start with 'deny'
+    // If this method is not set, all addresses are allowed
+    onMailFrom(address, session, callback) {
+        if (/^deny/i.test(address.address)) {
+            return callback(new Error('Not accepted'));
+        }
+        callback();
+    },
+
+    // Validate RCPT TO envelope address. Example allows all addresses that do not start with 'deny'
+    // If this method is not set, all addresses are allowed
+    onRcptTo(address, session, callback) {
+        let err;
+
+        if (/^deny/i.test(address.address)) {
+            return callback(new Error('Not accepted'));
+        }
+
+        // Reject messages larger than 100 bytes to an over-quota user
+        if (address.address.toLowerCase() === 'almost-full@example.com' && Number(session.envelope.mailFrom.args.SIZE) > 100) {
+            err = new Error('Insufficient channel storage: ' + address.address);
+            err.responseCode = 452;
+            return callback(err);
+        }
+
+        callback();
+    },
+
+    // Handle message stream
+    onData(stream, session, callback) {
+        stream.pipe(process.stdout);
+        stream.on('end', () => {
+            let err;
+            if (stream.sizeExceeded) {
+                err = new Error('Error: message exceeds fixed maximum message size 10 MB');
+                err.responseCode = 552;
+                return callback(err);
+            }
+            callback(null, true); // accept the message once the stream is ended
+        });
+    }
+});
+
+server.on('error', err => {
+    console.log('Error occurred');
+    console.log(err);
+});
+
+// start listening
+server.listen(SERVER_PORT, SERVER_HOST);