Open services.msc , find , and stop it.
Since there is no "backdoor" default password, if you cannot log in, follow these recovery steps: mdaemon default admin password
When you first install MDaemon, you are required to set up an administrator account. This account has full access to the MDaemon configuration and management interface, allowing you to control all aspects of your email server. The default admin password is set during the installation process, but it's crucial to understand that the method of setting this initial password can vary. Open services