On 8.3.2012, at 3.30, Jean-Daniel Beaubien wrote:

I have read most of the doc on the dovecot website, and couldn't find any info on the single instance storage feature, so I'm posting my questions here.

• Are these 3 parameters the only one necessary for single instance storage? I cannot find any doc on this feature on the website; is there anything specific I need to know about them? (the last one isn't exactly self-explanatory).

• mail_attachment_dir = /srv/vmail/attachments

• mail_attachment_hash = %{sha256}

• mail_cache_min_mail_count = 2

• Is this feature ready for production?

mail_cache_min_mail_count isn't related to single instance storage at all. I didn't really even remember that such a setting existed. I'm not sure if it's actually useful in any setups..

Maybe you were thinking about mail_attachment_min_size?

Other than that, yeah, the mail_attachment_dir is really the only thing you need to set to enable SIS.