Using QoS to set application priority

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Using QoS to set application priority

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Is it possible to set priority based on application?  Most of the configurations I've found were to limit bandwidth to certain applications, so I'm curious if this is even possible.

On my PA-500 I created a QoS policy with the smtp application and set it to class 2.  The default QoS profile already has class 2 as a higher priority than the default class of 4.  I then created a QoS interface on my untrusted interface (e1/1) with a maximum egress of 80 Mbps.  In the Clear Text Traffic tab I added the default QoS profile and set the source interface to my trusted zone (e1/2).

Does this sound right?  What am I missing?

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