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I cannot see any totally reliable way of distinguishing an email as a reply. Even relying on the subject line might not work, as the subject line can be changed by the person replying. In effect, each reply is really a totally new message which we can usually see is a reply based on various visual cues.The best try I can think of is to use a slightly different Reply To address when sending to one of your agencies group contacts (something like myname+agencyreply@fastmail.com) and sort based on that.
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