Check file /var/www/index.html, it's created by iRedMail and it redirects to '/mail'. You can remove it.
kornel891 wrote:
i want also to install phpMyAdmin and other services and enter by mydomain.com/phpmyadmin or mydomain.com/phpsysinfo etc..
Don't use phpMyAdmin, you may want to try http://adminer.org/ instead, it's just a single php file.