Enable prioirty queuing and verify this in Exchange 2013

Hello -

I am trying to enable Exchange priority queuing.  I've gone through this article https://technet.microsoft.com/en-us/library/jj891104(v=exchg.150).aspx and completed the steps without an issue.  #2 in the "How do you know if this worked" section, it says to test out, send an email as high priority that is larger than the max high priority value, which by default is 250KB and it should instead send as a normal email.   Well I did this, and when I receive it on the other end, its still a high priority email.  This leads me to believe that things are not working right.

Maybe this is normal behavior and the article is wrong?  Can someone help?

Thanks!