CompTIA Network+ (N10-008) — Question 517

Which of the following ports is used for secure email?

Answer options

• A. 25
• B. 110
• C. 143
• D. 587

Correct answer: D

Explanation

Port 587 is the standard port used for sending emails securely with SMTP over TLS/SSL. Port 25 is typically used for unencrypted SMTP, while ports 110 and 143 are associated with POP3 and IMAP respectively, which are protocols for receiving email and do not pertain to sending secure emails.