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用户删除消息或清空垃圾后，必须压缩服务器上的邮件数据库。

After users delete messages or empty the trash, they must compact their mail database on the server.

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对存储来说，您可以为每个用户或组设置每个挂载的文件系统的存储量或文件数的配额(限定)。

For storage, you can set quotas (limits) for the amount of storage or the number of files, per user and per group, for every mounted filesystem.

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