IPA IP 2026 Question 75
A question IPA Japan published in 令和8年度 ITパスポート試験 公開問題 問75, translated into English. ITPEC is based on the same exams.
Which of the following is an appropriate description concerning the Bcc field in entering the destinations of an e-mail?
Explanation
Bcc addresses are hidden from the To and Cc recipients — Bcc (blind carbon copy) sends a copy without showing others that it was sent.
The To and Cc addresses are written into the message header, so every recipient, including those in Bcc, can see them. The Bcc addresses are not passed on in the header, so the To and Cc recipients, and the other Bcc recipients, cannot see them. This is why a notice to many customers who do not know each other goes out with their addresses in Bcc: putting them in To or Cc would reveal every customer’s e-mail address to all the others.
Answer (d)
Why not others:
- •(a) — the reverse: Bcc recipients can see the To and Cc addresses, because those stay in the header
- •(b) — Bcc does not encrypt anything; encrypting e-mail needs S/MIME, PGP or a similar method
- •(c) — every recipient receives the same message, attachments included; Bcc changes only who can see the address
Key rule: To and Cc addresses are visible to all recipients; Bcc addresses are visible to none of the others.
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This question comes from the past questions IPA Japan publishes, translated into English by ITPEC Practice. ITPEC Practice is an independent study tool and is not affiliated with IPA or ITPEC. See the original paper (PDF) or Report an issue.