What is currently being recommended to customers, but that could be a charm option instead for the smtp relay config :
Configure postfix (it is already installed in the Nagios unit)
$ juju ssh nagios/0
$ dpkg-reconfigure -p high postfix #this will prompt questions, choose Satellite system to configure your mail name and the SMTP relay host.
Make sure you have the port 25 whitelisted in between your SMTP host and the nagios unit.
What is currently being recommended to customers, but that could be a charm option instead for the smtp relay config :
Configure postfix (it is already installed in the Nagios unit)
$ juju ssh nagios/0
$ dpkg-reconfigure -p high postfix #this will prompt questions, choose Satellite system to configure your mail name and the SMTP relay host.
Make sure you have the port 25 whitelisted in between your SMTP host and the nagios unit.