← Port Encyclopedia
2525
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
🛡️ Security Considerations
- Scan port 2525 with
nmap -sVto 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-altto 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