> On 01/12/2023 11:34 EET roger.meier--- via dovecot <dovecot@dovecot.org> 
> wrote:
> 
>  
> I try to setup for our mailserver (in a dc) a job backup to a secondary 
> server (in our office) with "doveadm backup" via the -R option. (rsync , 
> rsnapshot and so on tooks too long at the moment)
> 
> For the most user accounts all work as expected, but for three users it 
> always fails 
> 
> First run:
> /usr/bin/doveadm -Dv backup -Ru user1 tcp:mua01.domain.intra:12345
> 
> > Dec 01 08:54:21 doveadm(user1)<70126><qfzHDjyfaWXuEQEAy5X8iQ>: Debug: 
> > Mailbox INBOX: Mailbox opened because: copy caching decisions
> > Dec 01 08:54:22 doveadm(user1)<70126><qfzHDjyfaWXuEQEAy5X8iQ>: Warning: 
> > Deleting mailbox 'Archiv.Allgemein unsortiert': UID=1 
> > GUID=1350559209.P2052Q54.lin-mail1.intra is missing locally
> > Dec 01 08:54:22 doveadm(user1)<70126><qfzHDjyfaWXuEQEAy5X8iQ>: Debug: brain 
> > M: Import Archiv.Allgemein unsortiert: Import change type=save 
> > GUID=1350559209.P2052Q54.mail1.intra UID=1 > hdr_hash= result=Reverting 
> > local change by deleting mailbox - No more local mails found
> > Dec 01 08:54:22 doveadm(70126): Debug: brain M: Import Archiv.Allgemein 
> > unsortiert: Saved UIDs:
> > Dec 01 08:54:22 doveadm(70126): Debug: auth-master: conn 
> > unix:/run/dovecot/auth-userdb (pid=661,uid=0): Disconnected: Connection 
> > closed (fd=9)
> 
> So it aborts on the lines above and a incomplete maildir is on the local 
> server. so the next doveadm try say's that he can't delete INBOX , etc. 
> 
> > Dec 01 09:03:33 doveadm(user1)<70169><TzH+MmKhaWUZEgEAy5X8iQ>: Error: 
> > Mailbox INBOX sync: mailbox_delete failed: INBOX can't be deleted.
> 
> This a very old account on our server which was migrated over different 
> iterations of our dovecot mailserver. The user behind the account uses 
> outlook over years. 
> Is the space here a problem? 
> 
> Another user with a similiar issue has the following error message at the end:
> 
> > Dec 01 09:22:14 doveadm(user2)<70354><RU12FsWlaWXSEgEAy5X8iQ>: Debug: 
> > Mailbox INBOX: Mailbox opened because: copy caching decisions
> > Dec 01 09:22:56 doveadm(user2)<70354><RU12FsWlaWXSEgEAy5X8iQ>: Error: 
> > read(mua01.domain.intra) failed: EOF (last sent=mailbox, last recv=mailbox)
> > Dec 01 09:22:56 doveadm(70354): Debug: auth-master: conn 
> > unix:/run/dovecot/auth-userdb (pid=661,uid=0): Disconnected: Connection 
> > closed (fd=9)
> 
> I see that the user has a very big inbox? when i check in the source server 
> in the "cur" folder of the INBOX it count's around 269372 mails.  Is this 
> perhaps the issue for this message?
> 
> And on the last user it looks like:
> 
> Dec 01 09:25:19 doveadm(user3)<70376><UoiQAHWmaWXoEgEAy5X8iQ>: Warning: 
> Deleting mailbox 'Entwürfe': UID=1265 
> GUID=1521832311.M6830P7652.mail-mx1.intra,S=1764,W=1809 is missing locally
> Dec 01 09:25:19 doveadm(user3)<70376><UoiQAHWmaWXoEgEAy5X8iQ>: Debug: brain 
> M: Import Entwürfe: Import change type=save 
> GUID=1521832311.M6830P7652.mail-mx1.intra,S=1764,W=1809 UID=1265 hdr_hash= 
> result=Reverting local change by deleting mailbox - No more local mails found
> Dec 01 09:25:19 doveadm(70376): Debug: brain M: Import Entwürfe: Saved UIDs:
> Dec 01 09:25:19 doveadm(70376): Debug: auth-master: conn 
> unix:/run/dovecot/auth-userdb (pid=661,uid=0): Disconnected: Connection 
> closed (fd=9)
> 
> The "Entwürfe" folder directly cannot be the issue? On the filesystem the 
> folder has the name ".Entw&APw-rfe" and also other users has similar folders 
> in their mailboxes.
> 
> The source server has dovecot version 2.2.36 (centos 7.9.2009) and the 
> current destination server dovecot version 2.3.16 (ubuntu 22.04 lts)

Try deleting the target mailbox completely. This usually sorts these kind of 
things out. Also please see 
https://doc.dovecot.org/admin_manual/migrating_mailboxes/

Aki
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