doveadm backup + ISO 8859-1 mailbox name

[Michael Goth]

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 "Entwürfe" 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