Having a mess about with Nagios and it says to get notifications working I need to:
sudo apt-get install mailx
sudo apt-get install postfix
Problem is I'm not entirely sure which package from mailx to choose. I've chosen bsd-mailx but on Ubuntu it comes up with a blue screen asking me to choose a Postfix configuration option but I cannot work out how to proceed past this.
Anyone able to advise on how to install mailx and postfix on Ubuntu desktop?