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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Let's learn about email technology!
つまり、メールソフトにはメールを受信するだけでなく、受信したメールを
管理する機能が求められます。
■ メールソフトを使わずに POP で受信する
POP サーバーとのやり取りを確認するには、SMTP のやり取りと同様に
Telnet を使うのがわかりやすいでしょう。POP サーバーに接続するときは、
次のように「telnet」に続けて、IP アドレスとポート番号（110 番）を指定
します。
curl を使う方法でも同じです。
接続できたら、「USER」に続けてユーザー名を、「PASS」に続けてパスワー
ドを入力します。ここでは、「taro」というユーザー名で、パスワードに「p@
ssw0rd」を指定しています。
$ telnet 192.168.1.2 110
* About to connect() to x.x.x.x port 110 (#0)
* Trying x.x.x.x...
* Connected to x.x.x.x (x.x.x.x) port 110 (#0)
+OK Dovecot ready.
$ curl -v telnet://192.168.1.2:110
* About to connect() to x.x.x.x port 110 (#0)
* Trying x.x.x.x...
* Connected to x.x.x.x (x.x.x.x) port 110 (#0)
+OK Dovecot ready. ...
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