I tried installing a mail client on my server and somehow the regular site got messed up. I played around a bit with Postfix, Sendmail and Squirrelmail. My server uses Debian, Apache2. I'm not sure where I went wrong. Every time I try to visit the site Firefox tries to download a application/x-httpd-php file. I tried adding AddType and others to the .htaccess page, but nothing works.