After testing, I also found that:
I have further tested,
If you setup email routing to be 'Always route to this queue', it works, the reply comes from the email sender sent on.
If you setup email routing to be 'Always route to this flow', and from the flow it routes to a queue, it doesn't works, the reply comes from the email set on the queue.
------------------------------
Gita Jogia
Voice Consultant – IT Services
------------------------------