audioiosmacosmessages
I've noticed when I receive messages in the Messages app in El Capitan, it plays the "Chime" sound from iOS 9.
I recall that in the previous version of OSX, or perhaps the one before it, the incoming Messages notification sound was simply a different pitched variant of the "send" message sound.
How can I restore it to the original Messages sound from the older versions of OSX?
Have you tried selecting the folder in the folder list and then using the menu entry "Use This Mailbox For -> Sent" in the Mailbox menu?
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That should do exactly what you want.
You could ssh to the destination machine and run the following for each notification.
osascript -e 'display notification "Lorem ipsum dolor sit amet" with title "Title"'
Alternatively, there are a number of ways of running AppleScript remotely. You can do it with Keyboard Maestro, which allows you to run macros (that can run AppleScript) over the network:
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Mine's always just gone 'ping' so I don't know precisely which sound you mean