Investigate why node owner (up/down) emails not being received

[drn05r]

A node owner reported recently that they did not receive any notifications about a node going down. I am not sure if this was not sent of whether something blocks it being received either by our relay host or their mail server because something looks dodgy.

[drn05r]

I think these emails should go out from sown-monitor.ecs.soton.ac.uk. I can see that monitoring email is still being received from this server as I am on the monitoring alias and have received this email. Postfix is configured on sown-monitor but I cannot find a mail log (/var/log/mail.log is empty nothing is journalctl for postfix) to see what is going wrong.

[drn05r]

This may be due to the node owner's email address being broken as it is an alias. They are looking into getting this fix but I have setup a secondary email address that gets notifications for this node. If it goes down again, the node owner should be able to confirm if email notfications are broken or not.

[drn05r]

This looks to be down to a to address issue. This has been fixed but will require Ansible changes to ensure local changes are not overwritten. sown/ansible#50