SMTP-Alt

TCP

Email Medium Risk

Alternative SMTP — used when port 25 is blocked by ISPs

🔍 How to Scan Port 2525

nmap -sV -p 2525 target

nmap -sV -sC --script=banner -p 2525 target

nc -zv target 2525

Scan port 2525 with nmap -sV to identify the exact service and version
If SMTP-Alt is not needed, close or firewall this port immediately
Check for default credentials if a management interface runs on this port
Use searchsploit smtp-alt to find known exploits
Monitor traffic on port 2525 with Wireshark or tcpdump for anomalies
Ensure the service is patched to the latest version to prevent known CVE exploitation

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