hscan -sT -p 25 <target IP>
While Hscan 1.2 is a useful tool, there are other network scanning tools available, each with their own strengths and weaknesses: Smtp Scanner Hscan 1.2 Download
| Feature | Description | Technical Note | |---------|-------------|----------------| | | Connects to port 25 and reads the SMTP greeting banner (e.g., 220 Exchange Server 2003 ). | Helps identify software version and OS. | | Open Relay Test | Attempts to send an email from an external domain to another external domain via the target server. | If successful, the server is an open relay—a major spam vector. | | VRFY Command Scan | Uses the VRFY (verify) SMTP command to check if a specific user exists (e.g., VRFY root ). | Modern servers disable VRFY by default. Legacy systems may still respond. | | EXPN Command Scan | Uses EXPN (expand) to reveal mailing list memberships. | Another legacy risk heavily restricted today. | | User Enumeration | Brute-forces common usernames (admin, postmaster, webmaster, etc.) via VRFY or RCPT TO. | Can be used to build a valid user list for phishing. | hscan -sT -p 25 <target IP> While Hscan 1
hscan -sT -p 25 <target IP>
While Hscan 1.2 is a useful tool, there are other network scanning tools available, each with their own strengths and weaknesses:
| Feature | Description | Technical Note | |---------|-------------|----------------| | | Connects to port 25 and reads the SMTP greeting banner (e.g., 220 Exchange Server 2003 ). | Helps identify software version and OS. | | Open Relay Test | Attempts to send an email from an external domain to another external domain via the target server. | If successful, the server is an open relay—a major spam vector. | | VRFY Command Scan | Uses the VRFY (verify) SMTP command to check if a specific user exists (e.g., VRFY root ). | Modern servers disable VRFY by default. Legacy systems may still respond. | | EXPN Command Scan | Uses EXPN (expand) to reveal mailing list memberships. | Another legacy risk heavily restricted today. | | User Enumeration | Brute-forces common usernames (admin, postmaster, webmaster, etc.) via VRFY or RCPT TO. | Can be used to build a valid user list for phishing. |