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}