All ports
Port587/UDP
submissionPort
587
Protocol
UDP
Category
Well-Known
Service
submission
What is port 587?
Port 587/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the submission service.
Message Submission
Useful commands
nmapnmap -p 587 -sV example.comnetcatnc -zv example.com 587curlcurl -v http://example.com:587/telnettelnet example.com 587bash(echo > /dev/udp/example.com/587) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 587/udpDeny
sudo ufw deny 587/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 587 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 587 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=587/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 587" dir=in action=allow protocol=UDP localport=587Security Risks
- Unauthorized access to the service
- Data exposure if the service is unauthenticated
- Outdated versions with vulnerabilities
- Incorrect service configuration
Frequently Asked Questions
What service runs on port 587/UDP?
Port 587/UDP is associated with the submission service. Message Submission
Is it safe to expose port 587 to the Internet?
It depends on the service and configuration. Port 587 (submission) is a Well-Known port. If you need to expose it, keep the service updated, use strong authentication, and configure a firewall. It's always recommended to restrict access by IP when possible.
How do I check if port 587 is open?
You can use nmap: `nmap -p 587 -sV example.com`, netcat: `nc -zv example.com 587`, or the bash command: `(echo > /dev/udp/example.com/587) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 587 on my firewall?
On Linux with UFW: `sudo ufw allow 587/udp` (open) or `sudo ufw deny 587/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 587 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 587" dir=in action=allow protocol=UDP localport=587`.
What applications and services use port 587?
Port 587/UDP is used by the submission service. Specific uses depend on the software and configuration. Check our related tools section for more information.