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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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.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.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.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.
Let's learn about email technology!
■ メールの構造
郵便で手紙を送るとき、私たちは手紙を封筒に入れてポストに投函します。
配達員は手紙の中身を見るのではなく、封筒に書かれた宛先や差出人を見て
配送します。これと同じように、メールの送信において封筒に該当するものを
エンベロープといい、SMTP が使うのはエンベロープの情報です【図 2-1】。
図 2-1
エンベロープ
本文
From:taro@example.com
To:hanako@example.com
いつもお世話になっております。
…
エンベロープ
From:taro@example.com
To:hanako@example.com
メール本文
エンベロープ
メールソフト
メールサーバー メールサーバー
2
1
SMTP の通信
・メールソフトの裏側でのやり取りを知りたい方
・SMTP サーバーからの応答コードの意味を知りたい方
・メールソフトを使わずにコマンドを入力して送信するとき
使えるのはこんな人や場面！
60
059-080̲mail̲NSM̲F3.indd60059-080̲mail̲NSM̲F3.indd60 2024/01/309:452024/01/309:45
2
−
1
—
—
SMTPの通信
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