Hello,
Just send a purchase order via the API to my own email address (for testing). It’s been logged in the recent events, but it took a while to come through by email.
So, I checked the recent email log, but it doesn’t appear to be there.
The email has been received all OK, it’s just missing from the email log
Thanks for reporting, I’ve logged this on our bug tracking system so we’ll take a look shortly. Should be a simple fix.
EDIT:
@Parker1090 - How did you send the PO by email? Perhaps I’m missing something but I only see a create option and nothing in the create option to trigger a send.
It would appear I found a hidden function 
Saw it in the API sandbox:
It would seem so! I guess it was implemented some time ago but hasn’t been officially documented.
We’re looking into this now and we’ll get the event log entry fixed by the next release.
EDIT:
The logging should now work as expected.