Port 465: SMTPS
Port 465 is SMTP submission wrapped in TLS from the start (implicit TLS). Mail clients use it, or port 587, to send outgoing mail securely to a provider.
TCPEmail EncryptedIANA assigned
| Port number | 465 |
|---|---|
| Service | SMTP submission over TLS |
| Protocol | TCP |
| Category | |
| Default encryption | Yes (TLS/SSH) |
Frequently asked questions
What is port 465 used for?
Port 465 is SMTP submission wrapped in TLS from the start (implicit TLS). Mail clients use it, or port 587, to send outgoing mail securely to a provider.
Is port 465 TCP or UDP?
Port 465 (SMTPS) uses TCP.
Is port 465 secure?
Yes. Port 465 carries encrypted traffic by default, so data in transit is protected.
Should I open port 465 on my firewall?
Only if you specifically need SMTPS. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.