My mail server is an HTTP server. what is the server URL?

If your mail server is configured as an HTTP server, the server URL would typically take the form of http://yourdomain.com or https://yourdomain.com if SSL is enabled. Replace "yourdomain.com" with your actual domain name or IP address. Depending on your server configuration, you might also need to specify a port number (e.g., http://yourdomain.com:8080) if it's not using the default HTTP/HTTPS ports.