Port 143

Q: What is port 143?

Server-side email management without encryption (IMAP) IMAP on port 143 lets email clients manage messages directly on the server with full multi-device synchronization. Unlike POP3, emails remain on the server and folder structures are maintained. The connection is unencrypted — use IMAPS (port 993) for a TLS-secured connection. IMAP is the foundation of all modern email clients including Outlook, Thunderbird, and mobile apps.

IMAP

Server-side email management without encryption (IMAP)

Port

143

Protocol

TCP

Service

IMAP

Security

Restricted

Full name: Internet Message Access Protocol

What is port 143?

IMAP on port 143 lets email clients manage messages directly on the server with full multi-device synchronization. Unlike POP3, emails remain on the server and folder structures are maintained. The connection is unencrypted — use IMAPS (port 993) for a TLS-secured connection. IMAP is the foundation of all modern email clients including Outlook, Thunderbird, and mobile apps.

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