courier to dovecot migration

[Aki Tuomi]

On 30.9.2019 12.38, tovises wrote:
>> On 29.9.2019 23.38, tovises via dovecot wrote:
>>> I have a quite old home server based on Debian 6.x packages using
>>> courier
>>> imap server (exim4, fetchmail, courier, apache2, squirrelmail) to keep
>>> my
>>> and my wife emails (about 25G).
>>> I want renew my server to Debian 10 (buster) and got a recommendation to
>>> use dovecot instead of courier. For this purpose I'm using a different
>>> PC
>>> as a sandbox. Debian 10 currently offer dovecot version 2.3.4.1
>>> Installation was "peaceful" but stuck with the migration. I have choose
>>> migration using dsync, from Wiki I was choose this command:
>>>
>>> For per-user user/passwords use:
>>>
>>> doveadm -o imapc_user=foo -o pop3c_user=foo -o imapc_password=bar -o
>>> pop3c_password=bar backup -R -u user at domain imapc:
>>>
>>> (foo and bar placed real username and password)
>>>
>>> But I get error:
>>> doveadm(tovis at nusi.tovis-lab.mydomain.org): Error: User doesn't exist
>>>
>>> Strongly I have no real domain, I'm using "freedns". "nusi" is the local
>>> name of my old server, "tovis-lab" is conjunction with "mydomain.org"
>>> choose from freedns. I was trying short as "nusi" which is in /etc/hosts
>>> file even ip address but the same result. 143 and 943 ports are working
>>> only inside the firewall (OpenWrt).
>>> I was checked using telnet courier on the "remote" box and dovecot on
>>> the
>>> localhost. I was able to login.
>>>
>>> What should I use as "user at domain" in this situation?
>>>
>>>   tovis
>>>
>>>
>>>
>> Hi!
>>
>> -u parameter should be your *local* username, @domain is optional.
>>
>> Aki
>>
>>
>>
> Thank you Aki for quick response!
> Where i should define the remote IMAP server address/hostname?
> My localhost run dovecot, remote host (other box) running courier.
> The user name is the same (password too).
> -u tovis
> gives me "Error: Failed to initialize user: Namespace ''; Mailbox list
> driver imapc: missing imapc_host"
>
> Sincerely
>   tovis
>
You can put imapc_host and pop3c_host into config file or provide them
with -o. If you want to migrate POP3 uidls you need to make sure you
load that plugin, in either config or providing -o "mail_plugins=list of
plugins".

Aki