really sorry, but at the end of this guide this my result:

postfix: 

postfix/pickup[1373]: warning: maildrop/D4E1xxxxxx: queue file write error

 postfix/trivial-rewrite[1460]: warning: dict_ldap_lookup: transport: Search base '' not found: 32: No such object

dovecot:

Error: auth(default): LDAP: ldap_result() failed: Can't contact LDAP server

 Warning: Killed with signal 15

 dovecot can't connect to ldap server, postfix can't connect. where is content of /etc/postfix/virtual file?

sorry man, really thanks for your work.

zauaus