Configure your mail server to only relay emails from authenticated users or trusted internal IP addresses.
While it was once a staple in a security enthusiast's toolkit, modern environments have largely rendered it obsolete in favor of more robust tools like Nmap or OpenVAS .
Limitations
This essay is for educational purposes only. Always obtain written permission before scanning any network or server.
Configure the mail transfer agent (MTA) to ignore or reject VRFY and EXPN requests to prevent external user enumeration.
nmap -p 25 --script smtp-open-relay,smtp-commands <target-IP>
Nmap is the industry standard for network discovery and vulnerability scanning. It includes the Nmap Scripting Engine (NSE), which features specific scripts tailored for SMTP analysis.
The desire for an is understandable for those studying infosec history or maintaining legacy systems. Hscan was a marvel of efficiency in its time—packing port scanning, banner grabbing, and basic vulnerability checks into a 200KB executable.
was a popular multi-purpose vulnerability scanner originating in the early 2000s, often used for scanning various protocols, including SMTP.
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