mail-migration with dovadm sync/backup and mail_attachment_dir

I need to run a mail-migration from a Dovecot with mail_attachment_dir / single instance storage enabled.

As mailboxes and mail_attachment_dir are rsynced I would normally run a

doveadm backup -u <user> -R -d dbox:<path to rsynced mailbox>/dbox

How can I tell it the mail_attachment_dir the rsynced source / (reverse) destination uses?

Or do I have to start a Dovecot process and use imapc for the migration?

Ralf

-- Ralf Becker EGroupware GmbH [www.egroupware.org] Handelsregister HRB Kaiserslautern 3587 Geschäftsführer Birgit und Ralf Becker Leibnizstr. 17, 67663 Kaiserslautern, Germany Telefon +49 631 31657-0