dovecot - Dec 2013 - Duplicated (but only for unread) messages after second rsync pass...

Ok, I know I should probably be using dsync for this, but I'm more 
familiar with rsync, and didn't think this would be a problem.

Here is what I am doing, and what is apparently happening (only done 
this once, but I'm guessing it will happen each time):

rsync -avHP /mnt/vmail/example.com/user1/ /var/vmail/example.com/user1/

chown -R vmail:vmail /var/vmail/example.com

Ok, so far so good, everything works fine accessing the mails (I'm using 
Thunderbird).

Now I do another rsync, but this time I did  the entire mailstore:

rsync -avHP /mnt/vmail/example.com/ /var/vmail/example.com/

chown -R vmail:vmail /var/vmail/example.com

Right after I started up dovecot again, I hot a bunch of these in the logs:

2013-12-22T09:52:51-05:00 newhost dovecot: imap(user1 at example.com): 
Warning: Maildir /var/vmail/example.com/user1/: Expunged message 
reappeared, giving a new UID (old uid=45516, 
file=1387468268.Vfe02Ic1343fM845754.oldhost.sub.example.com:2,ST)
2013-12-22T09:52:51-05:00 newhost dovecot: imap(user1 at example.com): 
Warning: Maildir /var/vmail/example.com/user1/: Expunged message 
reappeared, giving a new UID (old uid=45518, 
file=1387468645.Vfe02Ic73e0eM530539.oldhost.sub.example.com:2,ST)

The problem is, it looks like every single message that was flagged as 
unread is now duplicated on the new system.

Also - not that this is a problem, but all of the old messages have the 
fqdn of the old server in the individual email file names - 
oldhost.sub.example.com - while the new ones only have the local 
hostname (newhost)

Did I do something wrong? Or is this going to be an unavoidable problem 
if I want to use rsync to do the final migration that using dsync would 
avoid?

Thanks,

-- 

Best regards,

*/Charles
/*

On 22.12.2013, at 17.13, Charles Marcus <CMarcus at Media-Brokers.com>
wrote:
> Ok, I know I should probably be using dsync for this, but I'm more
familiar with rsync, and didn't think this would be a problem.
> 
> Here is what I am doing, and what is apparently happening (only done this
once, but I'm guessing it will happen each time):
> 
> rsync -avHP /mnt/vmail/example.com/user1/ /var/vmail/example.com/user1/
> 
> chown -R vmail:vmail /var/vmail/example.com
> 
> Ok, so far so good, everything works fine accessing the mails (I'm
using Thunderbird).
> 
> Now I do another rsync, but this time I did  the entire mailstore:
> 
> rsync -avHP /mnt/vmail/example.com/ /var/vmail/example.com/
> 
> chown -R vmail:vmail /var/vmail/example.com
> 
> Right after I started up dovecot again, I hot a bunch of these in the logs:
> 
> 2013-12-22T09:52:51-05:00 newhost dovecot: imap(user1 at example.com):
Warning: Maildir /var/vmail/example.com/user1/: Expunged message reappeared,
giving a new UID (old uid=45516,
file=1387468268.Vfe02Ic1343fM845754.oldhost.sub.example.com:2,ST)
> 2013-12-22T09:52:51-05:00 newhost dovecot: imap(user1 at example.com):
Warning: Maildir /var/vmail/example.com/user1/: Expunged message reappeared,
giving a new UID (old uid=45518,
file=1387468645.Vfe02Ic73e0eM530539.oldhost.sub.example.com:2,ST)
> 
> The problem is, it looks like every single message that was flagged as
unread is now duplicated on the new system.
> 
> Also - not that this is a problem, but all of the old messages have the
fqdn of the old server in the individual email file names -
oldhost.sub.example.com - while the new ones only have the local hostname
(newhost)
The hostname doesn't matter.
> Did I do something wrong? Or is this going to be an unavoidable problem if
I want to use rsync to do the final migration that using dsync would avoid?
Use rsync --delete to get rid of the extra mails in destination. And of course
don't deliver any new mails to destination before that is done. :)