What is port 995 used for?
POP3 over TLS.
Should port 995 be open?
Usually open to the internet. This port is meant to be reachable publicly on servers that offer the service. The secure version of POP3. IMAP (993) is usually better because it keeps mail in sync across devices.
See what is listening on port 995
# Linux
sudo ss -tlnp | grep ':995 '
# macOS
sudo lsof -nP -i TCP:995 -sTCP:LISTEN
# Windows (PowerShell)
Get-NetTCPConnection -LocalPort 995 -State ListenOpen or block port 995 in a firewall
# Ubuntu / Debian (ufw)
sudo ufw allow 995/tcp
sudo ufw deny 995/tcp
# Windows (PowerShell, as administrator)
New-NetFirewallRule -DisplayName "Port 995" -Direction Inbound -Protocol TCP -LocalPort 995 -Action AllowOn cloud servers, also open the port in the provider’s security group or network firewall. At home, a service behind a router needs a port-forwarding rule to the device’s local IP.
Test it from outside
A port can be open on the server but blocked upstream. The Port Checker connects from the internet, so it shows what the world sees. From your own machine, use nc -vz example.com 995 (macOS/Linux) or Test-NetConnection example.com -Port 995 (Windows).
Port CheckerTest whether a server accepts connections on specific ports — web (80/443), mail (25/587/993), SSH, databases or remote desktop — and see which are open, closed or filtered by a firewall.
Open the tool Frequently asked questions
What is port 995?
POP3 over TLS.
Is it safe to open port 995?
Usually open to the internet. This port is meant to be reachable publicly on servers that offer the service.
How do I check if port 995 is open?
Enter your domain or public IP in the Port Checker with port 995. It tries a TCP connection from the internet and reports open, closed or filtered.