令和3年度 ITパスポート試験問59

This question's explanation and your answers so far.

問59

頻出度★★★

Aさんが, Pさん, Qさん及びRさんの3人に電子メールを送信した。Toの欄にはPさんのメールアドレスを, Ccの欄にはQさんのメールアドレスを, Bccの欄にはRさんのメールアドレスをそれぞれ指定した。電子メールを受け取った3人に関する記述として, 適切なものはどれか。

出典　令和3年度 ITパスポート試験問59

解説

問 59

Incorrectア
R was specified in the Bcc (blind carbon copy) field, and that address is hidden from the other recipients. P in the To field and Q in the Cc field cannot see the Bcc address, so they cannot tell that the email was also sent to R. Therefore this option, which says they “can tell”, is incorrect.
Incorrectイ
Q was specified in the Cc field, and that address is displayed to all recipients. P in the To field can look at the Cc field and tell that the email was also sent to Q, so this option, which says P “cannot tell”, is incorrect.
ウ
正解 Addresses specified in the Cc (carbon copy) field are written explicitly in the email header together with the To recipients, so all recipients can see one another. Q received the email via the Cc field and can see P's address shown in the To field, so Q can tell that the same email was also sent to P. Therefore “ウ” is correct.
Incorrectエ
What Bcc hides is only the fact that “R is a recipient”, and only from the other recipients; R can still see the To and Cc fields of the email delivered to R's own inbox. Therefore R can tell that the email was sent to P and Q, so this option, which says R “cannot tell”, is incorrect.

ここがポイント

Addresses specified in To and Cc are written explicitly in the email header, so all recipients can see one another's addresses. Addresses specified in Bcc, on the other hand, are hidden from the other recipients.
The Bcc recipient can see the To and Cc addresses. Note that what is hidden is only the fact that “they are a recipient”, and only from the others.

用語

解答問59ウ