All ports
Port3332/UDP
mcs-mailsvrPort
3332
Protocol
UDP
Category
Registered
Service
mcs-mailsvr
What is port 3332?
Port 3332/UDP is a Registered port, registered with IANA for specific applications. It is associated with the mcs-mailsvr service.
MCS Mail Server
Useful commands
nmapnmap -p 3332 -sV example.comnetcatnc -zv example.com 3332curlcurl -v http://example.com:3332/telnettelnet example.com 3332bash(echo > /dev/udp/example.com/3332) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 3332/udpDeny
sudo ufw deny 3332/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 3332 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 3332 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=3332/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 3332" dir=in action=allow protocol=UDP localport=3332Security Risks
- Open relay used for spam
- Email spoofing
- Brute force attacks against email accounts
- Information disclosure in email headers
Frequently Asked Questions
What service runs on port 3332/UDP?
Port 3332/UDP is associated with the mcs-mailsvr service. MCS Mail Server
Is it safe to expose port 3332 to the Internet?
It depends on the service and configuration. Port 3332 (mcs-mailsvr) is a Registered 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 3332 is open?
You can use nmap: `nmap -p 3332 -sV example.com`, netcat: `nc -zv example.com 3332`, or the bash command: `(echo > /dev/udp/example.com/3332) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 3332 on my firewall?
On Linux with UFW: `sudo ufw allow 3332/udp` (open) or `sudo ufw deny 3332/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 3332 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 3332" dir=in action=allow protocol=UDP localport=3332`.
What applications and services use port 3332?
Port 3332/UDP is used by the mcs-mailsvr service. Specific uses depend on the software and configuration. Check our related tools section for more information.