Using tools like HScan on networks you do not own or have explicit permission to test may violate local laws and terms of service.
It could be a search for or a historical overview of how early 2000s-era scanning tools like Hscan functioned. Smtp Scanner Hscan 1.2 Download
: It can identify valid user accounts on a mail server by testing common usernames. Open Relay Detection Using tools like HScan on networks you do