What is the default port number used by SMTP for server-to-server email transfer?
Options
- A. 21
- B. 25
- C. 110
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
B. 25
Detailed Explanation
Correct Answer: Port 25
- TCP port 25 is the standard SMTP port for mail transfer between servers.
- Port 587 is commonly used for message submission with authentication.
- Port 465 is commonly used for SMTP submission over implicit TLS.