automatically create Spam mailbox

Cliff Hayes chayes at
Thu Nov 13 23:01:26 UTC 2014

I am trying to set up dovecot to automatically create a Spam mailbox for 
every user. shows how to do this but not 
what config file to put it in so I assume 10-mail.conf.
When I put it in there as follows...

namespace inbox {
   mailbox Spam {
     auto = create
     special_use = \Junk

... I get the following error ...

doveconf: Fatal: Error in configuration file 
/etc/dovecot/conf.d/10-mail.conf line 107: Unknown setting: mailbox

How do I create the mailbox?

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