Server Offline Alerts

May need to script something remotely as the offline server would not be able to do anything. 

There are many scripts here you may be able to modify to suit your needs.

https://gallery.technet.microsoft.com/scriptcenter/

or request a script to be written here.

https://gallery.technet.microsoft.com/scriptcenter/site/requests

or ask for help with writing a script here.

https://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=winserverpowershell

https://social.technet.microsoft.com/Forums/en-US/home?forum=ITCG

(please don't forget to mark helpful replies)