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
−
7
—
—
携帯電話のプッシュ型メール
るプロトコルです。Exchange ActiveSync は、IMAP IDLE に比べてバッテ
リーの消費が少なく、セキュリティの面でも優れているといわれていますが、
Exchange 以外のサーバーでは使えません。
■ 携帯電話事業者のメール
上記は一般的なメールサーバーを使った場合のしくみですが、携帯電話事業
者が付与するメールアドレスを使う場合は、独自のプロトコルでメールを通信
しているといわれています。
その詳細は公開されていませんが、メールが届いたことを SMS（ショート
メッセージ）のようなしくみで端末に通知し、その通知が届いた端末がメール
を受信するなどの方法が考えられます【図 2-13】。
この方法であれば、メールソフトが頻繁にメールサーバーにアクセスする必
要もありませんし、常にメールサーバーに接続している必要もありません。
ただし、専用のメールソフトが必要ですし、SMS の送信が必要なため、携
帯電話事業者のような組織が管理しているメール以外では使えません。
図 2-13
SMS による新着通知
自動で受信操作
①
SMS
で通知
③
メール
受信
②
受信操作
メールサーバー
143
103
081-104̲mail̲NSM̲F2.indd103081-104̲mail̲NSM̲F2.indd103 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.