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TCP
Safe
995 POP3S
POP3S protects POP mailbox retrieval with TLS from the start of the session.
Security Context
Port 995 is commonly expected on managed infrastructure, but it still needs scoped exposure, TLS where applicable, and service-specific hardening.
Nmap Check
Use a version probe first so you confirm whether the expected service is really what is listening on this port.
nmap -sV -p 995 <host>Firewall Commands
UFW
sudo ufw allow 995/tcpiptables
sudo iptables -A INPUT -p tcp --dport 995 -j ACCEPT