dovecot - Apr 2019 - doveadm backup + ISO 8859-1 mailbox name

Hi!

I'm trying to migrate a mailbox from an old IMAP server (not Dovecot) to 
a new Dovecot server with 'doveadm backup'. The command fails because of
an unexpected character in a mailbox name:


doveadm -o imapc_user=ag at example.org \
         -o imapc_password=XXX \
         -o imapc_host=old-mailserver.webflow.de \
         -o imapc_port=993 \
         -o imapc_ssl=imaps \
         -o imapc_ssl_verify=no \
         -o imapc_features=rfc822.size,fetch-headers \
         -o ssl_client_ca_dir=/etc/ssl \
         backup -R -f -x ~* -u migration-ag at example.org imapc:

dsync(migration-ag at example.org): Info: 
imapc(old-mailserver.webflow.de:993): Connected to 1.1.1.1:993 (local 
2.2.2.2:46154)
dsync(migration-ag at example.org): Error: Failed to access mailbox 
Entw?rfe: mailbox does not exist


The problem is with "Entw?rfe" here. It's actually
Entw<0xfc>rfe, which
translates to "Entw?rfe" in ISO-8859-1.

Why can't doveadm find that mailbox? Is the old mailserver misbehaving 
(I hope not because I have no idea how to change that...), or does this 
happen on the new server? Can I tell doveadm something that makes this work?


Thank you

Michael



-- 
Michael Goth

.webflow GmbH

Gesch?ftsf?hrer: Andreas Schrei
Wasserburger Stra?e 4
D - 83352 Altenmarkt a. d. Alz

Amtsgericht Traunstein HRB 18537

E-Mail:   mg at webflow.de
Tel:      +49 (0) 8621 - 99989 - 26
Fax:      +49 (0) 8621 - 99989 - 28
Web:      www.webflow.de

> On 3 Apr 2019, at 13.40, Michael Goth via dovecot <dovecot at
dovecot.org> wrote:
> 
> Hi!
> 
> I'm trying to migrate a mailbox from an old IMAP server (not Dovecot)
to a new Dovecot server with 'doveadm backup'. The command fails because
of an unexpected character in a mailbox name:
> 
> 
> doveadm -o imapc_user=ag at example.org \
>        -o imapc_password=XXX \
>        -o imapc_host=old-mailserver.webflow.de \
>        -o imapc_port=993 \
>        -o imapc_ssl=imaps \
>        -o imapc_ssl_verify=no \
>        -o imapc_features=rfc822.size,fetch-headers \
>        -o ssl_client_ca_dir=/etc/ssl \
>        backup -R -f -x ~* -u migration-ag at example.org imapc:
> 
> dsync(migration-ag at example.org): Info:
imapc(old-mailserver.webflow.de:993): Connected to 1.1.1.1:993 (local
2.2.2.2:46154)
> dsync(migration-ag at example.org): Error: Failed to access mailbox
Entw?rfe: mailbox does not exist
> 
> 
> The problem is with "Entw?rfe" here. It's actually
Entw<0xfc>rfe, which translates to "Entw?rfe" in ISO-8859-1.
> 
> Why can't doveadm find that mailbox? Is the old mailserver misbehaving
(I hope not because I have no idea how to change that...), or does this happen
on the new server? Can I tell doveadm something that makes this work?
> 
Can you log on the remote imap server with telnet or nc and ask for: A LIST
"" "*"

I think your legacy server does not encode the folder names correctly.

Sami

On 4/3/19 2:23 PM, Sami Ketola via dovecot wrote:
> 
> 
>> On 3 Apr 2019, at 13.40, Michael Goth via dovecot <dovecot at
dovecot.org> wrote:
>>
>> Hi!
>>
>> I'm trying to migrate a mailbox from an old IMAP server (not
Dovecot) to a new Dovecot server with 'doveadm backup'. The command
fails because of an unexpected character in a mailbox name:
>>
>>
>> doveadm -o imapc_user=ag at example.org \
>>         -o imapc_password=XXX \
>>         -o imapc_host=old-mailserver.webflow.de \
>>         -o imapc_port=993 \
>>         -o imapc_ssl=imaps \
>>         -o imapc_ssl_verify=no \
>>         -o imapc_features=rfc822.size,fetch-headers \
>>         -o ssl_client_ca_dir=/etc/ssl \
>>         backup -R -f -x ~* -u migration-ag at example.org imapc:
>>
>> dsync(migration-ag at example.org): Info:
imapc(old-mailserver.webflow.de:993): Connected to 1.1.1.1:993 (local
2.2.2.2:46154)
>> dsync(migration-ag at example.org): Error: Failed to access mailbox
Entw?rfe: mailbox does not exist
>>
>>
>> The problem is with "Entw?rfe" here. It's actually
Entw<0xfc>rfe, which translates to "Entw?rfe" in ISO-8859-1.
>>
>> Why can't doveadm find that mailbox? Is the old mailserver
misbehaving (I hope not because I have no idea how to change that...), or does
this happen on the new server? Can I tell doveadm something that makes this
work?
>>
> 
> Can you log on the remote imap server with telnet or nc and ask for: A LIST
"" "*"
> 
> I think your legacy server does not encode the folder names correctly.
That too includes the <FC> byte in its output. But I've found that
only
a couple of mailboxes are affected, so i just renamed the folders.

Thanks for your help!

Michael