ratzkiwatzki on Sent Mail Sound

I'm trying to set up a filter to play a "sent mail" sound but it's not working. The sound does not play when I send messages. I'm hoping someone can help. I'm on a Mac running TB 24.5.0.

I've set Apply Filter When to Run Manually and turned off When Getting Mail.
I've set it to Match any of the following: From is myemailaddress@XXX.com
I've set Perform these actions to: Play Sound and the name of the file.
Then I hit okay.

In the Message Filters window I've set Filter for myemailaddress@XXX.com
In Run selected filter(s) on, I've tried myemailaddress@XXX.com, Sent Mail, Drafts, etc. but it keeps defaulting to "Inbox." as soon as I close the window.

Any ideas? I've got screen shots I can send, if that helps.

Thanks.