Comonly used Email Port Numbers

The following are the most frequently used well known port numbers for email communications or used by mail servers.

Port Number
Protocol
Function
25
TCP
SMTP Mail Server (for sending outgoing emails)
110
TCP
POP3 (for receiving email)
119
TCP
NNTP (Network News Transfer Protocol)
143
TCP
IMAP4 Protocol (for email service)
465
TCP
Secure SMTP (email) using SSL
993
TCP
Secure IMAP protocol over SSL (for emails)

 

Gmail Ports

Port
TCP/UDP
Service
995
TCP
Incoming POP3 mail server
465
TCP
Outgoing SMTP Mail server (SSL Port )
587
TCP
Outgoing SMTP Mail Server (TLS/Start TLS Port)
TCP UDP Ports