← 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 -sV to 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-submission to 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

🔗 Related Email Ports

Port 25
SMTP
Port 110
POP3
Port 143
IMAP
Port 465
SMTPS
Port 691
MS-Exchange
Port 993
IMAPS
Port 995
POP3S
Port 2525
SMTP-Alt
Port 7071
Zimbra
Port 7078
Zimbra-LMTP

📍 Nearby Ports

Port 582
Port-582
Port 583
Port-583
Port 584
Port-584
Port 585
Port-585
Port 586
Port-586
Port 588
Port-588
Port 589
Port-589
Port 590
Port-590
Port 591
FileMaker
Port 592
Port-592
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