dovecot - Jul 2020 - Migrating from qmail server, invalid option "o" in dsync

> On 30. Jul 2020, at 19.33, Aki Tuomi <aki.tuomi at open-xchange.com>
wrote:
> 
>> 
>> On 30/07/2020 19:29 Justin Coleman <jmcoleman at gmail.com>
wrote:
>> 
>> 
>> Hi folks,
>> I have an old server running qmail with several years of mails in
maildir format I want to migrate to a new server, without requiring fresh client
download of everything.
>> 
>> Old server is debian 6(?). Local IP is 192.168.0.1.
>> New server is Debian 10, local IP is 192.168.0.25.
>> 
>> I have dovecot 2.3.4.1 (latest from apt stable) installed and
apparently working - if I manually copy the home directory for my account, I can
connect (using thunderbird) and I get all the emails appearing as new, forcing
redownload. Seems like the new config is at least functional.
>> 
>> I'm trying to follow the migration guide at
https://wiki2.dovecot.org/Migration/Dsync, but I am getting an error message:
>> root at newserver:~# doveadm backup -R -u _user_ -o pop3c_user=_user_
-o pop3c_password=_password_
>> backup: invalid option -- 'o'
>> doveadm backup [-u <user>|-A] [-S <socket_path>] [-fPRU]
[-l <secs>] [-r <rawlog path>] [-m <mailbox>] [-g
<mailbox_guid>] [-n <namespace> | -N] [-x <exclude>] [-s
<state>] [-t <start date>] -d|<dest>
>> 
> 
> doveadm -o pop3c_user=_user_ -o pop3c_password=_password_ backup -R -u
_user_  pop3c:

Also I suggest to migrate over imap, not pop3. With pop3 migration you can't
save the imap uid:s and all clients will see the mails as new.

Sami

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Maybe I'm misunderstanding - all of our clients use pop3 (thunderbird and
eudora). Do pop3 and imap overlap somehow, or does the server use IMAP
internally regardless of the client protocol settings?

Thanks!

On Thu, Jul 30, 2020 at 12:52 PM Sami Ketola <sami.ketola at dovecot.fi>
wrote:
>
>
> On 30. Jul 2020, at 19.33, Aki Tuomi <aki.tuomi at open-xchange.com>
wrote:
>
>
> On 30/07/2020 19:29 Justin Coleman <jmcoleman at gmail.com> wrote:
>
>
> Hi folks,
> I have an old server running qmail with several years of mails in maildir
> format I want to migrate to a new server, without requiring fresh client
> download of everything.
>
> Old server is debian 6(?). Local IP is 192.168.0.1.
> New server is Debian 10, local IP is 192.168.0.25.
>
> I have dovecot 2.3.4.1 (latest from apt stable) installed and apparently
> working - if I manually copy the home directory for my account, I can
> connect (using thunderbird) and I get all the emails appearing as new,
> forcing redownload. Seems like the new config is at least functional.
>
> I'm trying to follow the migration guide at
> https://wiki2.dovecot.org/Migration/Dsync, but I am getting an error
> message:
> root at newserver:~# doveadm backup -R -u _user_ -o pop3c_user=_user_ -o
> pop3c_password=_password_
> backup: invalid option -- 'o'
> doveadm backup [-u <user>|-A] [-S <socket_path>] [-fPRU] [-l
<secs>] [-r
> <rawlog path>] [-m <mailbox>] [-g <mailbox_guid>] [-n
<namespace> | -N] [-x
> <exclude>] [-s <state>] [-t <start date>] -d|<dest>
>
>
> doveadm -o pop3c_user=_user_ -o pop3c_password=_password_ backup -R -u
> _user_  pop3c:
>
>
>
> Also I suggest to migrate over imap, not pop3. With pop3 migration you
> can't save the imap uid:s and all clients will see the mails as new.
>
> Sami
>
>
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Justin> Maybe I'm misunderstanding - all of our clients use pop3
Justin> (thunderbird and eudora). Do pop3 and imap overlap somehow, or
Justin> does the server use IMAP internally regardless of the client
Justin> protocol settings?

No, IMAP and POP are just the transport mechanisms.  But POP is old
and doesn't keep state well.  If you can, upgrade all your clients to
IMAP, thunderbird will be easy to do so, and I suspect Eudora will be
as well, but I haven't touched it in years.

why don't you just setup a test IMAP account and try a client?