Which protocol operates on TCP port 25 and is responsible for relaying outbound email between Mail Transfer Agents (MTAs) on the Internet?
Simple Network Management Protocol (SNMP)
Post Office Protocol 3 (POP3)
Internet Message Access Protocol (IMAP)
Simple Mail Transfer Protocol (SMTP)
Simple Mail Transfer Protocol (SMTP) uses TCP port 25 by default when mail servers hand off messages to one another. POP3 (port 110) and IMAP (port 143) are used by clients to retrieve email, while SNMP (port 161) is for network management. Because SMTP is the only protocol in the list that both runs on TCP port 25 and transports outgoing email between servers, it is the correct choice.
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