I was asked to create a transport rule to tag all incoming email from outside the organization by prepending [EXTERNAL] to the subject line. This works correctly. The problem is if someone inside replies to an external message and they reply back, [EXTERNAL] is prepended again. They did not want that so I added an exception 'except when the subject fields contains specific words [EXTERNAL] to the rule but it still appends [EXTERNAL]. I'm unable to determine why it's failing.
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