On 26.8.2012, at 18.40, Alex wrote:

> is it possible to configure dovecot so that it only serves mailboxes
> of specified users? All other users should be completely ignored so
> that no indexing of messages or other resource consuming actions take
> place.

You can configure passdb/userdb to give different settings to different users. 
So maybe for some users you return mail_location with :INDEX=MEMORY and don't 
accept their passwords. Depends on your setup what exactly you need to do..

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