Ubuntu remove sendmail

sudo apt-get remove sendmail sendmail-bin postfix
sudo apt-get purge postfix exim4 sendmail sendmail-bin
sudo reboot

VirtualHost 127.0.0.1:8080 overlaps with VirtualHost 127.0.0.1:8080

[warn] VirtualHost 127.0.0.1:8080 overlaps with VirtualHost 127.0.0.1:8080, the first has precedence, perhaps you need a NameVirtualHost directive

Apache listen only on 127.0.0.1 (Nginx front-end etc.) and host multiple subdomains in Apache

vi /etc/apache2/ports.conf

NameVirtualHost 127.0.0.1
Listen 127.0.0.1:80

Use this on vhosts

<virtualhost 127.0.0.1>
</virtualhost>