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Email client protocols and port numbers

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This article needs attention; however, it is not necessarily a stub or an orphan.


The port numbers you set determine the protocol your email client uses. There are four basic options. IMAP secure is the recommended configuration:

  • IMAP (insecure)
  • IMAP (secure)
  • POP3 (insecure)
  • POP3 (secure)

Below are the settings you can use for each protocol along with the security settings.

Incoming

IMAP | Port 143 (Insecure Transport - No SSL function enabled)

IMAP | Port 993 (Secure Transport - SSL function enabled)

POP3 | Port 110 (Insecure Transport - No SSL function enabled)

POP3 | Port 995 (Secure Transport - SSL function enabled)

Outgoing

SMTP | Port 587 (Insecure Transport - No SSL function enabled)

SMTP | Port 465 (Secure Transport - SSL function enabled)

SMTP | Port 25 (username/password authentication MUST also be enabled!)

Port 587 is a highly recommended alternative port because port 25 is often blocked by ISPs.