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Exchange Hybrid mail flow rpf-violated question

Successfully deployed an Exchange hybrid with our on-prem exchange 2013 dag....to an extent. I can mail on-prem to E365, but when trying to send from E365 to on-prem, my ASA5515 is blocking due to an rpf-violation. Mail flow originates at our outbound wan ip 69.xx.xx.20 and then comes inbound to 69.xx.xx.6 (mail.on-prem-exchange) so the Unicast policy thinks it is a spoofed ip. Is there any way to fix this? Sorry for the newb question, but appreciate any help (our external ASA support vendor is unavailable at the moment).

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