← Port Encyclopedia
587
SMTP-Submission
TCP
Email
High Risk
Email submission port — authenticated SMTP, STARTTLS encryption
🔍 How to Scan Port 587
nmap -sV -p 587 target
nmap -sV -sC --script=banner -p 587 target
nc -zv target 587
🛡️ Security Considerations
- Scan port 587 with
nmap -sVto identify the exact service and version - If SMTP-Submission is not needed, close or firewall this port immediately
- Check for default credentials if a management interface runs on this port
- Use
searchsploit smtp-submissionto find known exploits - Monitor traffic on port 587 with Wireshark or tcpdump for anomalies
- Ensure the service is patched to the latest version to prevent known CVE exploitation