[Dovecot] Implementing Single instance attachment storage (SIS) with sdbox

Pascal Volk user+dovecot at localhost.localdomain.org
Wed Mar 27 14:49:37 EET 2013

On 03/27/2013 12:30 PM megodin at inboxalias.com wrote:
> Hi there,
> as I want to implement data dedupliction on my dovecot system (eg. a users sends the same attchment to 5 different users on my system so I only have to store the attachment one time and set pointers to the file) , I found out it could be possible with Single instance attachment storage (SIS), so I read several pages about SIS as it was quoted here (http://wiki2.dovecot.org/MailboxFormat/dbox): 
>> dbox storage is extensible. Single instance attachment storage was already implemented as such extension. 
> But I did not found any further intructions in Dovecot Wiki how to implement it - however, on Dovecots blog there was an older article from Timo which gave some indication how to get it work (http://blog.dovecot.org/2010/07/single-instance-attachment-storage.html):
>> mail_location = dbox:~/dbox:ATTACHMENTS=/attachments/$/$
> But when I change my configuration according to this (I use sdbox as mail format), I just get a "Unknown setting: ATTACHMENTS" in my mail.err log.
> Can anybody give me a clue how to get this working?

Hm, that blog post seems to be a little bit old. There is no need to
modify the mail_location setting.
All single instance storage related settings could be found at the end
of conf.d/10-mail.conf

The trapper recommends today: fabaceae.1308601 at localdomain.org

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