Using the wrong port number can lead to several issues, including:
1. Failed Deliveries: Your emails may not be sent or received, leading to failed email campaigns. 2. Error Messages: You may receive error messages such as "Could not connect to the server" or "Connection timed out," indicating that the port number is incorrect. 3. Security Risks: Using an incorrect, unsecured port may expose your email communications to vulnerabilities, leading to potential data breaches.