feat(mail/delivery): add error-count based blocking to rate limiter; improve test SMTP server port selection; add tsbuild scripts and devDependency; remove stale backup file

test/helpers/server.loader.ts

@@ -30,8 +30,19 @@ export interface ITestServer {
  * Starts a test SMTP server with the given configuration
  */
 export async function startTestServer(config: ITestServerConfig): Promise<ITestServer> {
+  // Find a free port if one wasn't specified
+  // Using smartnetwork to find an available port in the range 10000-60000
+  let port = config.port;
+  if (port === undefined || port === 0) {
+    const network = new plugins.smartnetwork.Network();
+    port = await network.findFreePort(10000, 60000, { randomize: true });
+    if (!port) {
+      throw new Error('No free ports available in range 10000-60000');
+    }
+  }
+
   const serverConfig = {
-    port: config.port || 2525,
+    port: port, // Use the found free port
     hostname: config.hostname || 'localhost',
     tlsEnabled: config.tlsEnabled || false,
     authRequired: config.authRequired || false,
@@ -57,6 +68,7 @@ export async function startTestServer(config: ITestServerConfig): Promise<ITestS
         recordAuthenticationFailure: async (_ip: string) => {},
         recordSyntaxError: async (_ip: string) => {},
         recordCommandError: async (_ip: string) => {},
+        recordError: (_key: string) => false, // Return false to not block during tests
         isBlocked: async (_ip: string) => false,
         cleanup: async () => {}
       };
@@ -157,19 +169,19 @@ export async function startTestServer(config: ITestServerConfig): Promise<ITestS
 
   // Create SMTP server
   const smtpServer = await createSmtpServer(mockEmailServer, smtpOptions);
-  
+
   // Start the server
   await smtpServer.listen();
-  
+
   // Wait for server to be ready
   await waitForServerReady(serverConfig.hostname, serverConfig.port);
-  
+
   console.log(`✅ Test SMTP server started on ${serverConfig.hostname}:${serverConfig.port}`);
-  
+
   return {
     server: mockEmailServer,
     smtpServer: smtpServer,
-    port: serverConfig.port,
+    port: serverConfig.port, // Return the port we already know
     hostname: serverConfig.hostname,
     config: serverConfig,
     startTime: Date.now()