Email Address Policy (EAP) - "Do Not Apply" characteristics

Question

I'll be updating an existing email address policy and to manage the impact of making this change i will be selecting "Do Not Apply" on the scheduling page.   I understand that this configuration will enable the updated policy
to be applied to newly created recipients and existing recipients that have one or more attributes changed.   I have been searching the web but have been unable to identity what attribute change(s) would result in the reasssessment of a recipients'
email address policy.   Can you direct me to some microsoft documentation which identifies what exactly triggers this reassessment for an individual recipient?

Answer 1

Albert your post is very helpful.  After reading your post and both articles a few things are clarified...
1.  EAP is reapplied if either Exchange Management Shell or Exchange Management Console are used to initiate a change to recipient(s).  (From Blog)
2.  When an email address policy is modified and saved, all associated recipients are updated with the change.  (From Technet)
With this information the following should be true when an EAP is updated and "Do Not Apply" is selected.
An existing recipient will not have their EAP reevaluated unless EMC or EMS is used to update that recipient, or if an administrator manually forces a reevaluation for all users.
New recipients will evaluate EAPs and have the appropriate EAP applied during provisioning.
Modifying attributes using tools other than the two mentioned above will not trigger an reevaluation and subsequent association of a policy with a recipient.
Using EMS and EMC to modify recipients triggers some process that results in a reevaluation and enforcement of EAPs associated with the modified recipient. 
The gist of these finding for me is that I can use non Exchange tools to update AD and EAP reevaluation will not be triggered.  I'll do some testing to confirm, but i think that this heads me in the right direction.  
Thank you!