Port
Port 465 — SMTPS
Port 465 (TCP) is used by SMTPS. SMTP over implicit TLS (legacy submission).
Port 465 at a glance
| Property | Value |
|---|---|
| Port number | 465 |
| Transport | TCP |
| Service | SMTPS |
| Category | Well-known port |
What it is used for
SMTP over implicit TLS (legacy submission).
Security considerations
Use with TLS; 587 with STARTTLS is the modern alternative.
See our full TCP/UDP port reference and learn how firewalls filter ports in the CyberOps course.
Frequently asked questions
What is port 465 used for?
Port 465 (TCP) is used by SMTPS. SMTP over implicit TLS (legacy submission).
Is port 465 TCP or UDP?
Port 465 uses TCP.
Is it safe to open port 465?
Use with TLS; 587 with STARTTLS is the modern alternative.
Related
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