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!
■ 本文と署名のルール
本文については自由に記述して構いません。しかし、電子メールのフォー
マットを定めている RFC 5322 では、1 行の長さは「CRLF を除いて、各行
は 998 文字を超えてはならず（MUST）、78 文字を超えるべきではない
（SHOULD）」と書かれています。
この「CRLF」
※4
というのは改行文字のことです。このルールを満たすため、
改行せずに長い文章を書くと、利用者が設定した文字数を上限として自動的に
改行するメールソフトが多いものです。
この文字数は日本語の字数ではなく、アルファベットを基準とした長さです。
詳しくは第 4 章で解説しますが、日本語で書いたメールは文字をアルファベッ
トに変換して送信されます。ひらがなやカタカナ、漢字の 1 文字がアルファ
ベットの 2 文字に変換されると考えると、日本語の文章は 35 文字程度で改行
したほうがよいといわれています。
なお、受信したメールに返信するとき、多くのメールソフトでは元のメール
の本文を引用するしくみが用意されています。先頭に「>」という記号をつけ
ることで、どこが引用なのかをわかるようにする方法です。
引用のマークの例
いつもお世話になっております。
以下、インラインで回答いたします。
> 質問 1：○○○○○○○○○○○？
□□□□□□□□□□□□□□□□□□
> 質問 2：○○○○○○○○○○○？
□□□□□□□□□□□□□□□□□□
よろしくお願いします。 ...
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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.