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TCP
Safe
993 IMAPS
IMAPS secures mailbox synchronization for clients that keep server-side message state.
Security Context
Port 993 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 993 <host>Firewall Commands
UFW
sudo ufw allow 993/tcpiptables
sudo iptables -A INPUT -p tcp --dport 993 -j ACCEPT