Port 995TCP
POP3 is encrypted.
What is the purpose of port 995?
Email. The protocol or service generally associated is POP3S.
Transport Protocol
TCP
Safety precautions
Prefer to POP3 110 if POP remains necessary.
Should we open this port in the firewall?
Only if a service is actually needed the use it. Apply the principle of any privilege: limit the authorized sources, destinations and interfaces, and then log connections when relevant.
How do I check this port?
Test-NetConnection SERVER -Port 995Under Linux, you can use nc -vz SERVER 995.
Port/service associations are common conventions. An application can be configured on another port.