[Dovecot] Filesystem quotas

[Steve Fatula]

>From:Eduardo Casarero <ecasarero at gmail.com>
>To:Steve Fatula <compconsultant at yahoo.com>
>Cc:Dovecot List <dovecot at dovecot.org>
>Sent:Sunday, October 9, 2011 2:37 PM
>Subject:Re: [Dovecot] Filesystem quotas
>
>
>But if you dont use quotas how do you know if the user is out of space? Or does the user gets a notification that it's running out of space, before you start rejecting emails?
How do I know, or, how does the user know? I couldn't care less, so, not an issue for me. The user gets notification when their used space is above a certain percent. These are system users, so, email is just one part of their quota space. They might have 1 email, and build a massive file, they'd still be out of space. 

So, what do I get by using the Dovecot Quota/FS plugin? Is it just a matter of it counting used space? Something else? Better handling of out of space?