On 02/ 3/16 03:47 PM, zucca@systemschmiede.com wrote:

was wondering if it was possible to store mail attachments on a separate storage with dovecot, and if so, how. Of course a single instance storage of these attachments would also be a very good thing, allthough not a basic prerequisite.

Yes. The description of the settings are in conf.d/10-mail.conf

## ## Mail attachments ##

# sdbox and mdbox support saving mail attachments to external files, which # also allows single instance storage for them. Other backends don't support # this for now.

# Directory root where to store mail attachments. Disabled, if empty. #mail_attachment_dir =

# Attachments smaller than this aren't saved externally. It's also possible to # write a plugin to disable saving specific attachments externally. #mail_attachment_min_size = 128k

# Filesystem backend to use for saving attachments: # posix : No SiS done by Dovecot (but this might help FS's own deduplication) # sis posix : SiS with immediate byte-by-byte comparison during saving # sis-queue posix : SiS with delayed comparison and deduplication #mail_attachment_fs = sis posix

# Hash format to use in attachment filenames. You can add any text and # variables: %{md4}, %{md5}, %{sha1}, %{sha256}, %{sha512}, %{size}. # Variables can be truncated, e.g. %{sha256:80} returns only first 80 bits #mail_attachment_hash = %{sha1}