I've a problem about webmail.
On new sites, the url
get a download file screen and login.php fail.
Other sites on the same server execute it perfect.
I put suphp + suexec + this code on apache directives at options tab like the sites working fine.
AddHandler application/x-httpd-php .inc .php4 .phtml .php .php3 .php5
AddHandler application/x-httpd-php .Inc .php4 .phtml .php .php3 .php5