February 2024
Beginner to intermediate
304 pages
9h 13m
Japanese
Content preview from 実務で使える メール技術の教科書 基本のしくみからプロトコル・サーバー構築・送信ドメイン認証・添付ファイル・暗号化・セキュリティ対策まで
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エラーメールを配送するためのメールアドレスとして正し
いものはどれか？
A）本文中の From B）エンベロープ From
C）本文中の To D）エンベロープ To
A）POP はコマンドで操作できるが、IMAP はコマンドで操作でき
ない
B）POP ではパスワードは不要だが、IMAP ではパスワードが必要
である
C）IMAP ではコマンドの前に識別子の入力が必要である
D）POP より IMAP のほうが高速にメールを処理できる
POP と IMAP を比較したとき、コマンド入力時の特徴と
して正しいものはどれか？
A）Date B）Content-Type C）Sender D）Return-Path
メールヘッダーとして必須のフィールド名はどれか？
A）メールの送信に使われている 25 番ポートを指す
B）メールの受信に使われている 110 番ポートや 143 番ポートを指
す
C）メールの送信に使われる 465 番ポートを指す
D）メールの送信に使われる 587 番ポートを指す
OP25B で使われている「サブミッションポート」につい
て正しいものはどれか？
正解）Q1：B、Q2：C、Q3：A、Q4：D
Let's learn about email technology!
104
081-104̲mail̲NSM̲F2.indd104081-104̲mail̲NSM̲F2.indd104 2024/01/259:452024/01/259:45
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.