email services never start

[ATT1]

Editing the users email settings in the web interface,  I get a warning:

"Mail account is unavailable because either there isn't any mail virtual domain created or you need to save changes in order to activate the new domains.
Click here to create a new mail virtual domain"

Okay, so mail is not started, but why?

Trying to start mail:

root@zentyal-cyprus:~# service zentyal status
Usage: /etc/init.d/zentyal start|stop|restart
       /etc/init.d/zentyal <module> start|stop|status|enabled|restart
root@zentyal-cyprus:~# service zentyal mail status
Zentyal: status module mail:         [ STOPPED ]
root@zentyal-cyprus:~# service zentyal mail start
 * Restarting Zentyal module: mail                                       [fail]
root command set -e
samba-tool domain exportkeytab '/etc/dovecot/dovecot.keytab' --principal 'zentyal-mail-zentyal-cyprus'
samba-tool domain exportkeytab '/etc/dovecot/dovecot.keytab' --principal 'imap/zentyal-cyprus.niotronic.lan'
samba-tool domain exportkeytab '/etc/dovecot/dovecot.keytab' --principal 'imap/zentyal-cyprus.niotronic.lan@NIOTRONIC.LAN'
samba-tool domain exportkeytab '/etc/dovecot/dovecot.keytab' --principal 'smtp/zentyal-cyprus.niotronic.lan'
samba-tool domain exportkeytab '/etc/dovecot/dovecot.keytab' --principal 'smtp/zentyal-cyprus.niotronic.lan@NIOTRONIC.LAN'
samba-tool domain exportkeytab '/etc/dovecot/dovecot.keytab' --principal 'pop/zentyal-cyprus.niotronic.lan'
samba-tool domain exportkeytab '/etc/dovecot/dovecot.keytab' --principal 'pop/zentyal-cyprus.niotronic.lan@NIOTRONIC.LAN'
chown 'root':'dovecot' '/etc/dovecot/dovecot.keytab'
chmod '440' '/etc/dovecot/dovecot.keytab' failed.
Error output: GENSEC backend 'gssapi_spnego' registered
 GENSEC backend 'gssapi_krb5' registered
 GENSEC backend 'gssapi_krb5_sasl' registered
 GENSEC backend 'spnego' registered
 GENSEC backend 'schannel' registered
 GENSEC backend 'naclrpc_as_system' registered
 GENSEC backend 'sasl-EXTERNAL' registered
 GENSEC backend 'ntlmssp' registered
 GENSEC backend 'http_basic' registered
 GENSEC backend 'http_ntlm' registered
 GENSEC backend 'krb5' registered
 GENSEC backend 'fake_gssapi_krb5' registered
 interpret_string_addr_internal: getaddrinfo failed for name eth1 (flags 32) [Name or service not known]
 interpret_interface: Can't find address for eth1
 interpret_string_addr_internal: getaddrinfo failed for name eth1 (flags 32) [Name or service not known]
 interpret_interface: Can't find address for eth1
 ERROR(runtime): uncaught exception - Key table entry not found
   File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 175, in _run
     return self.run(*args, **kwargs)
   File "/usr/lib/python2.7/dist-packages/samba/netcmd/domain.py", line 117, in run
     net.export_keytab(keytab=keytab, principal=principal)

Command output: .
Exit value: 255
root@zentyal-cyprus:~#

That's right, I only need eth0, I have not configured eth1..... but.... why should I ?

What shall I do to get mail to work ?

[ATT1]

I forgot to say: Used system is latest Zentyal 4.2 with all updates....

Edit: Addendum: I found out that it is a very bad idea on Zentyal 4.2 to do " samba-tool domain provision" again.
The reprovisioning seems to mess up some database, the result of this will be that the users corner is suddenly gone, possibly due to a corrupted database, and the only way to clear up this mess is to re-install Zentyal, so far.