On 8.4.2014, at 15.44, Renaud Allard <ren...@allard.it> wrote: > I am running dovecot 2.2.12 > Current mail storage is sdbox and I am trying to compress all emails, which > works fine, except for a few old mailboxes. > > If I run the following dsync command > "dsync -u flea -o "mail_plugins=zlib" mirror maildir:~/ndbox" > > It fails with: > dsync(flea): Error: Exporting mailbox INBOX failed: Backend doesn't support > GUIDs, sync with header hashes instead > > Doing "doveadm dump flea/dbox/mailboxes/INBOX/dbox-Mails/dovecot.index" > reveals that there are very old mails (about 5 years ago) without any guid > like that one: > RECORD: seq=1, uid=1560, flags=0x00 > - ext 1 modseq : 16043 (ab3e000000000000) > - ext 3 cache : 396 (8c010000) > - cache offset=396 size=20, prev_offset = 0 > - guid: > > So, my question is: is there a way to force dovecot to assign a guid to those > messages?
Not directly. You could use dsync via imapc to access those mailboxes and convert them. http://wiki2.dovecot.org/Migration/Dsync