Mail users receive email notifications when more than 95% of their mailbox disk space is occupied.

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In the Horde and Roundcube webmail clients, mail users can also see the information about the mailbox storage disk space, its usage, and limits.

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Mailbox quota notifications for mail users are enabled by default. To turn them off, add the following lines to the panel.ini file:

[mail]
enableMailboxQuotaWarning = off