Atenção usuários de email com anti-spam (Uol e Bol).
sudo nano /etc/apache2/mods-enabled/dir.conf
<IfModule mod_dir.c> DirectoryIndex index.html index.cgi index.pl index.php index.xhtml index.htm</IfModule>
<IfModule mod_dir.c> DirectoryIndex index.php index.html index.cgi index.pl index.xhtml index.htm</IfModule>