Port 465 — SMTP submission / implicit TLS

TCPEmail & Messaging

Port 465 is used for mail submission with implicit TLS: the TLS handshake begins immediately after the TCP connection.

Registry assignments, software defaults and local listeners are different things. A port number alone does not identify or secure a service.

Configuration and troubleshooting

Select implicit TLS in your mail client and use the provider hostname. Do not reuse a port-587 STARTTLS setting unchanged on 465.

Important limitations

Submission still needs correct authentication and certificate validation. This port is not an open relay or a replacement for all server-to-server SMTP.

Read-only checks: run on the server host

Choose the commands for your OS. Check TCP and UDP separately. No result is not a lasting availability guarantee; inspect host and container separately.

Linux

sudo ss -ltnp 'sport = :465'

macOS

sudo lsof -nP -iTCP:465 -sTCP:LISTEN

Windows PowerShell

Get-NetTCPConnection -LocalPort 465 -State Listen

Sources and review

Sources checked on:

This review covers the explanations and sources on this page, not your device or every community software entry below.

Software Using This Port (4 software)

Community software entries: links are references, not individual verification.

Postfix SMTPS

PostfixsecureSMTP

Reference link ↗

Secure Mail

securemailtransfer

SMTPS Secure Mail Transfer

SMTP over SSL/TLS

Reference link ↗

SMTPSMail

SMTP over SSL/TLSSecurityMail

Usage Suggestions

  • Before using port 465, please confirm it is not occupied by other services
  • If you encounter port conflicts, consider using other ports or stopping the occupying service

Quick Info

Port
465
Protocol
TCP
Categories
Email & Messaging
Usage Status
4 software in use

Related Ports

Port 25TCP
→
Port 587TCP
→

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