Port 465 — SMTPS (legacy)
Quick reference for TCP/UDP port 465, used by SMTPS (legacy). Includes what the service does, security guidance and related ports.
What is port 465?
SMTP over TLS (legacy implicit TLS port).
What port does SMTPS (legacy) use?
SMTPS (legacy) listens on port 465 by default.
Is port 465 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 465
Test-NetConnection HOST -Port 465
nmap -p 465 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
Low risk — designed for public exposure
Port 465 (SMTPS (legacy)) is designed for public exposure. Standard hardening (TLS certs, current firmware, sensible rate limits) is enough — no special isolation needed.
Related ports
Frequently asked
What is port 465 used for?+
Port 465 is the standard TCP/UDP port for SMTPS (legacy). SMTP over TLS (legacy implicit TLS port).
What port does SMTPS (legacy) use?+
SMTPS (legacy) listens on port 465 by default.
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