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Many organizations use the MailMarshal "Prepend to subject" rule action on all incoming messages to tag messages as external.
If the message does not have a "Subject:" header the prepend action does not work.
To resolve this issue, you can add the missing header. This action can be applied in the same rule with the Prepend action.
When a message arrives,And the message is incomingThen rewrite message headers using 'insert subject' And prepend [EXTERNAL] to message subject And continue processing
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