dovecot - Apr 2011 - Re-downloading mails after migrate server

Hi all,

first of all, I must say that I am pretty new to mailing lists, so 
please, if I do something wrong, just tell me.

Now, my problem.
I'm migrating a mail service from a temporal to a definitive server. 
Both servers have the same versions (Postfix, Dovecot -1.0.7, POP3 & 
IMAP services-, MySQL) and it all works perfectly.
The only problem is with the users that store their mail on the server; 
on the testing, when I check if there is new mail, I download the mail 
stored on the new server once more. After that, it works correctly (no 
more unwanted downloads), but I need to avoid that first download.

I have been investigating before writing to the list. I have checked 
that UIDL are the same on both servers, and the configuration is exactly 
the same except for the name of the server; I have seen in few places 
that it may be the cause for downloading thdovecote mail again, so I 
changed the name of the new server to the old's one, but it happened again.

I know that lots of servers are migrated every day, and never heard 
about those problems, so I suppose it must be a solution for this, or 
maybe a better way to configure the servers.

If you wanna take a look at the configuration of both servers, I have 
pasted them on here --> http://pastebin.ca/2051228

Please, let me now if you need any more information.


Thanks in advance
-- 

Esther Y?benes
esther.yebenes at conzentra.com <mailto:esther.yebenes at conzentra.com>
Tel. +34 93 412 3750. Ext. 306
Fax. +34 902 889 440
Conzentra
your internet bussines partner
www.conzentra.com <http://www.conzentra.com>

----- Original Message ----- 
From: "Esther Y?benes --Conzentra--" <esther.yebenes at
conzentra.com>
>
> I know that lots of servers are migrated every day, and never heard
> about those problems, so I suppose it must be a solution for this, or
> maybe a better way to configure the servers.
>
  Happen to us as well.  Seemed to be specific to certain email clients 
though.  Thunderbird and Eudora did not download all the emails, Outlook 
did.

  It appeared to also occur with users that POP3 using multiple clients 
(Outlook and smart phone for instance) as well as those that had Outlook set 
to "Leave a copy on server for x days".

  Pete

I think a good try is update the new server to latest dovecot version.
I migrate about 1.5M mailboxes from dovecot 1.0.X to Dovecot 2.0.X and no
problems (and we have a lot of users with the "leave copy on server"
option
checked).

http://wiki2.dovecot.org/Migration

On Thu, Apr 28, 2011 at 9:41 AM, Pete Conkin <pete at reach.net> wrote:
> ----- Original Message ----- From: "Esther Y?benes --Conzentra--"
<
> esther.yebenes at conzentra.com>
>
>
>> I know that lots of servers are migrated every day, and never heard
>> about those problems, so I suppose it must be a solution for this, or
>> maybe a better way to configure the servers.
>>
>>   Happen to us as well.  Seemed to be specific to certain email clients
> though.  Thunderbird and Eudora did not download all the emails, Outlook
> did.
>
>  It appeared to also occur with users that POP3 using multiple clients
> (Outlook and smart phone for instance) as well as those that had Outlook
set
> to "Leave a copy on server for x days".
>
>  Pete
>