diff --git a/test/helpers/server.loader.ts b/test/helpers/server.loader.ts
index 8b95012..941d489 100644
--- a/test/helpers/server.loader.ts
+++ b/test/helpers/server.loader.ts
@@ -46,6 +46,20 @@ export async function startTestServer(config: ITestServerConfig): Promise<ITestS
     processEmailByMode: async (emailData: any) => {
       console.log(`📧 [Test Server] Processing email:`, emailData.subject || 'No subject');
       return emailData;
+    },
+    getRateLimiter: () => {
+      // Return a mock rate limiter for testing
+      return {
+        recordConnection: (_ip: string) => ({ allowed: true, remaining: 100 }),
+        checkConnectionLimit: async (_ip: string) => ({ allowed: true, remaining: 100 }),
+        checkMessageLimit: (_senderAddress: string, _ip: string, _recipientCount?: number, _pattern?: string, _domain?: string) => ({ allowed: true, remaining: 1000 }),
+        checkRecipientLimit: async (_session: any) => ({ allowed: true, remaining: 50 }),
+        recordAuthenticationFailure: async (_ip: string) => {},
+        recordSyntaxError: async (_ip: string) => {},
+        recordCommandError: async (_ip: string) => {},
+        isBlocked: async (_ip: string) => false,
+        cleanup: async () => {}
+      };
     }
   } as any;
 
@@ -131,14 +145,14 @@ export async function startTestServer(config: ITestServerConfig): Promise<ITestS
     socketTimeout: serverConfig.timeout,
     connectionTimeout: serverConfig.timeout * 2,
     cleanupInterval: 300000,
-    auth: serverConfig.authRequired ? {
+    auth: serverConfig.authRequired ? ({
       required: true,
       methods: ['PLAIN', 'LOGIN'] as ('PLAIN' | 'LOGIN' | 'OAUTH2')[],
       validateUser: async (username: string, password: string) => {
         // Test server accepts these credentials
         return username === 'testuser' && password === 'testpass';
       }
-    } : undefined
+    } as any) : undefined
   };
 
   // Create SMTP server