[Dovecot] Rebuilding message guid in sdbox

[Timo Sirainen]

On 8.4.2014, at 15.44, Renaud Allard <renaud at 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