We are running Exchange Server 2013 – Enterprise edition. Currently we have an inbound content filtering rule on our Symantec Messaging Gateway appliances to where when an email arrives from the internet addressed to someone inside our domain a suffix in the message subject is added in the form of {external} for example if I send an email from an internet account to internal user with the messages Subject of “Test 123” the subject to the internal email recipient will arrive as “Test 123 {External}”. The problem we are running in to is that when an email conversation takes places between an internal user and someone on the internet the {External} suffix keeps getting added to each external reply to where after three emails the subject will look like “Test 123 {External} {External} {External}”. I have looked through Exchange 2103 ECP – Mail Flow – Rules to see if there is any way to remove the {External} suffix on the emails leaving our domain to the internet all this while preserving the original subject, but to my understanding it is all or none. I am wondering if anyone else has had any experience with it or has a better suggestion for a workaround.
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