[Dovecot] Dovecot has no understandable configuration any more

Hello,

my last problem could be solved now with

userdb { driver = static args = uid=mail gid=mail home=/srv/mail/%d/%n }

I can connect to dovecot locally with an webmailer. But there is no listener process to be seen outside of the server?

Locally this ports are working, but not outside:

# netstat -tulpn | grep dove tcp6 0 0 :::110 :::*
LISTEN 5741/dovecot tcp6 0 0 :::143 :::*
LISTEN 5741/dovecot tcp6 0 0 :::993 :::*
LISTEN 5741/dovecot tcp6 0 0 :::995 :::*
LISTEN 5741/dovecot

Is this a configuration problem inside dovecot?

Another problem is the migration from the existant emails from V1 to V2: In the log i can find:

Apr 30 11:14:57 imap(xxxx@yyyy): Error: Broken file /srv/mail/yyyy/xxxx/.INBOX.dir.09/dovecot-uidlist line 1: Broken header (uidvalidity = 0, next_uid=697)

How can i recover this? Delete all the index files?

Has someone an idea how to migrate the emails from charset ISO8859-1 to UTF-8?

Best regards Karsten