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Which of the following TCP/IP ports are associated with email?
20 and 21
123, 135 and 137
118 and 119
25, 110 and 143
Port 25 is used for SMTP, the protocol you use to send email. Port 110 is used for POP3, and port 143 is used for IMAP. POP3 and IMAP are the protocols that are most often used for receiving email. When you refresh your inbox, you're probably pinging either a POP3 server or an IMAP server.
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