220-801 · Question #645
A standard Internet mail account receives incoming messages on which of the following ports?
The correct answer is B. 110. Port 110 is assigned to POP3 (Post Office Protocol version 3), the standard protocol used by mail clients to retrieve incoming email messages from a mail server.
Question
A standard Internet mail account receives incoming messages on which of the following ports?
Options
- A80
- B110
- C143
- D443
How the community answered
(23 responses)- A4% (1)
- B91% (21)
- D4% (1)
Why each option
Port 110 is assigned to POP3 (Post Office Protocol version 3), the standard protocol used by mail clients to retrieve incoming email messages from a mail server.
Port 80 is assigned to HTTP and is used for unencrypted web traffic, not email retrieval.
POP3 listens on TCP port 110 by default and allows a mail client to download messages from the server's mailbox to the local device. It is the traditional incoming mail protocol assigned by IANA and is distinct from SMTP (port 25) used for sending mail.
Port 143 is assigned to IMAP (Internet Message Access Protocol), which is an alternative incoming mail protocol that keeps messages on the server rather than downloading them.
Port 443 is assigned to HTTPS and is used for TLS-encrypted web traffic, not email.
Concept tested: POP3 protocol and port 110 for incoming email
Source: https://datatracker.ietf.org/doc/html/rfc1939
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