[Dovecot] Multiple Maildir?

[Marc Perkel]

On 10/9/2012 3:42 PM, Daniel Parthey wrote:
> Marc Perkel wrote:
>> if the mail location doesn't exist
>> then I want to try a second mail location:
>> mail_location = maildir:/email/%d/%n:INBOX=/email/%d/%n:LAYOUT=fs
> You might do this with a script which exports the MAIL environment
> variable and then executes the service binary:
>
> http://wiki2.dovecot.org/MailLocation#Custom_mailbox_location_detection
>
> Regards
> Daniel

I see the idea. But how do I pick up the name and domain parameters to 
test the directory?