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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2
5
メールヘッダー
■ メールヘッダーが活用される「フィルタリング」
メールヘッダーにはさまざまな情報が含まれていますが、利用者がその中身
を見ることはほとんどありません。しかし、メールソフトはその中身に応じて
さまざまな処理をしています。
代表的な例がメールのフィルタリングです。フィルタリングとは、指定した
条件でメールを自動的に分類・整理したり、不要なメールを排除したりするこ
とを指します。これにより、特定の送信元からのメールを特定のフォルダに移
動できます。
フォルダに移動する条件を事前に指定しておくことで、受信したメールの管
理を効率化できたりします。このときに使われるのが、差出人のメールアドレ
スや件名の他、送信された日付などメールヘッダーにある情報です。
たとえば、Gmail では From や To、件名、本文に含まれる文字、添付ファ
イルのサイズなどに応じて一般の利用者が自由にフィルタを作成できます【図
2-9】。
図 2-9
メールのフィルタ作成
メールを振り分ける
条件を指定する
「フィルタを作成」のボタンで
フィルタを作成できる
91
081-104̲mail̲NSM̲F2.indd91081-104̲mail̲NSM̲F2.indd91 2024/01/259:452024/01/259:45
Let's learn about email technology!
これは一般的な利用者が確認できる情報を使ったフィルタリングですが、
メールヘッダーを使ったフィルタリングが役に立つのが ...
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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.