Transport rule should trigger based on AIP Label


Hi....i am about to set a few AIP labels for classification. All are working but one. I have created a Internal buttonlabel that i would like to  block external recepients for if used the message should only sent to internal users 



The Label: Internal (no protection)

Transport Rule: if header contains words "Sensitivity=Internal"

Block with message


Do i make sense? Pointers itowards a solution are most welcome ;)


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