The standard mail handlers cannot do this, they have a simple "read email, stick it in predefined project".
You need to find/write a listener to do this for you. Personally, when this comes up, I just go run off to the JEMH addon because it can do clever things with routing incoming email. There may be other addons, but JEMH really does extend the email of JIRA a lot and you'll find other useful stuff in it.
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