doveadm backup + ISO 8859-1 mailbox name

[Sami Ketola]

> 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.

Sami