Which port must be open to allow sending emails from a client to a server?

Which port must be open to allow sending emails from a client to a server?

  1. a) 25 or 587
  2. b) 110
  3. c) 143
  4. d) 443

From the Combined Bank Officer (IT) January 2026 – Written (BIBM) exam, question 28 of 115.

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