[Dovecot] Unknown quota backend / imap dump-capability process returned 89

[Timo Sirainen]

On Wed, 2008-12-17 at 14:12 +0100, Frank Elsner wrote:
> IEffective uid=65534, gid=65534, home=/tmp
> FUnknown quota backend: 0

It sees "QUOTA=0" or "QUOTA=0:something" environment for some reason.
With this patch you'll see the entire environment value:
http://hg.dovecot.org/dovecot-1.1/rev/3c2f9e53eb5c

> plugin:
>   quota: maildir:INBOX

This looks correct.

> The "mail_executable: /usr/dovecot/libexec/dovecot/imap-quota" currently reads:

Have you tried without your own mail_executable?

I don't really see how this error is possible with your configuration.
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