The script checks the X-Powered-By header or SMTP banner to identify the hMailServer version.
If you’re looking for details about known vulnerabilities in hMailServer (an open-source Windows email server), here’s what you should know: hmailserver exploit github
Have you discovered a new HmailServer vulnerability? Submit a responsible disclosure via the official HmailServer GitHub repository or contact the maintainers directly. The script checks the X-Powered-By header or SMTP