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@dovecot.fi> wrote:


On 30. Jul 2020, at 19.33, Aki Tuomi <aki.tuomi@open-xchange.com> wrote:


On 30/07/2020 19:29 Justin Coleman <jmcoleman@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@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