Setup Apache2.4 (Ubuntu 13.10)

http://www.binarytides.com/install-apache-ubuntu-13-10/

Setup mailserver:

Very good information (working out of the box, just 5 first commands):

http://ubuntuguide.org/wiki/Mail_Server_setup

http://www.blime.com/tag/mail-stack-delivery/

Follow-up information for virtual domains etc:

https://help.ubuntu.com/community/PostfixCompleteVirtualMailSystemHowto

Enable user_mod (user directory php) and Restart Apache

sudo emacs /etc/apache2/mods-available/php5.conf

comment away:

#    <IfModule mod_userdir.c>
#        <Directory /home/*/public_html>
#            php_admin_value engine Off
#        </Directory>
#    </IfModule>

sudo service apache2 restart

(Eller  sudo /etc/init.d/apache2 restart and you might be done!)

Complete copy of the entire post:

From http://emphaticnonsense.com/2011/10/06/enabling-apache-php-execution-in-user-directories-on-ubuntu-lucid/