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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メールの容量制限、再送、輻輳
また、mbox（Mailbox）形式でメールを管理している場合
※8
、メールボッ
クス全体の容量は「mailbox_size_limit」で、バーチャルドメイン
※9
におけ
る 1 つのメールボックスの容量は「virtual_mailbox_limit」で指定します。0
を指定すると無制限になります。
これらを変更してから、Postfix の設定ファイルを再読み込みすると反映さ
れます。再起動ではなく、次のように再読み込みすることでメールサーバーを
停止することなく反映できます。
■ Dovecot におけるメールボックスの容量制限
IMAP を使ってメールボックスの容量を制限するときは、RFC 9208 で定
められた「QUOTA」という拡張を使います。Dovecot では「quota」とい
うプラグインで実現されています。このプラグインを使うには、Dovecot の
設定ファイルで次の行を編集します。
さらに、次の「90-quota.conf」というファイルにある「Quota limits」と
いう部分に、次のようなルールを追加します。
# service postfix reload
/etc/dovecot/conf.d/10-mail.conf
mail_plugins = $mail_plugins quota
/etc/dovecot/conf.d/90-quota.conf
plugin {
quota = maildir:User quota
quota_rule ...
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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.