diff --git a/backend/src/modules/mail/mail.service.ts b/backend/src/modules/mail/mail.service.ts
index 0c2be27..2d96a6e 100644
--- a/backend/src/modules/mail/mail.service.ts
+++ b/backend/src/modules/mail/mail.service.ts
@@ -69,21 +69,17 @@ export class MailService {
     const smtpUser = this.configService.get<string>('smtp_user');
     const smtpPassword = this.configService.get<string>('smtp_password');
 
-    const transportConfig: SMTPTransport.Options = {
+    const transportConfig = {
       host: smtpHost,
       port: smtpPort,
       secure: smtpSecure,
       pool: true,
       maxConnections: 1,
       maxMessages: 100,
-    };
-
-    if (smtpAuthRequired && smtpUser && smtpPassword) {
-      transportConfig.auth = {
-        user: smtpUser,
-        pass: smtpPassword,
-      };
-    }
+      ...(smtpAuthRequired && smtpUser && smtpPassword
+        ? { auth: { user: smtpUser, pass: smtpPassword } }
+        : {}),
+    } as SMTPTransport.Options;
 
     return transportConfig;
   }