Best way to move mail from one server to another

[Admin]

I used (had to) imapsync two weeks ago to move Mails from dovecote 2.1 to 2.2, as doveadm failed (different versions issue).

Worked as expected. But all mails 60GB got resynced (summed up to approx. 250GB due to several accounts being used across multiple clients).

Tried both - without and with uid option. With latter one I did not have any duplicate mails being skipped; resync however seemed to be unavoidable.

-M

> Am 26.09.2018 um 16:18 schrieb Tanstaafl <tanstaafl at libertytrek.org>:
> 
> Never mind, should have waited and read the entire thread...
> 
> On Wed Sep 26 2018 09:52:26 GMT-0400 (Eastern Standard Time), Tanstaafl
> <tanstaafl at libertytrek.org> wrote:
>> Finally have some time to review list emails...
>> 
>> On Tue Sep 04 2018 03:41:50 GMT-0400 (Eastern Standard Time), Sami
>> Ketola <sami.ketola at dovecot.fi> wrote:
>>> imapsync always loses data.
>> 
>> Hi Sami,
>> 
>> Can you expand on this?
>> 
>> I used ImapSync to migrate from Dovecot to Office365 a couple of years
>> ago, and didn't notice any issues with it at all.
>