Many thanks Zhang, i appreciate your help, you are right, next time i will include the required information in the post.
I used the "find / -name main.inc.php*" instruction and to find the first file, the result was:
/usr/share/apache2/roundcubemail-0.9.2/config/main.inc.php.dist
/usr/share/apache2/roundcubemail-0.9.2/config/main.inc.php
i found the file..
For the second file there is an overloading on that name.
root@$:/usr/share/apache2/roundcubemail-0.9.2/config# find / -name dovecot.conf*::::
/usr/share/logwatch/default.conf/services/dovecot.conf
/usr/share/dovecot/dovecot.conf
/usr/share/doc/dovecot-core/dovecot/example-config/dovecot.conf
/run/dovecot/dovecot.conf
/etc/init/dovecot.conf
/etc/dovecot/dovecot.conf
/etc/dovecot/dovecot.conf.2013.11.17.16.01.15
/etc/fail2ban/filter.d/dovecot.conf
After testing every file i found the param in "/run/dovecot/dovecot.conf"..
Thanks.