Postfix - custom reply

This is the Postfix program at host srv2.xxx.de.

I'm sorry to have to inform you that your message could not be
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

<postmaster@xxx.de>: permission denied. Command output: maildrop: maildir
over quota.

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