Unattended upgrades

Email From

Add the following line in 50unattended-upgrades 

Unattended-Upgrade::Sender "Unattended-upgrades Example <noreply@example.com>";

Automatic reboot

Uncomment the following lines in 50unattended-upgrades and change accordingly 

Unattended-Upgrade::Automatic-Reboot "true";
Unattended-Upgrade::Automatic-Reboot-Time "02:00";