Outbound emails being NAT'ed to a different IP than Inbound
We have an Exchange server and two paths out to the internet. We are considering a configuration where emails would come in through one circuit and leave through the second circuit, being NAT'ed to a different IP. We realize there are some concerns here regarding these emails being marked as SPAM when other email servers run various DNS checks. Is this configuration acceptable and are there ways to protect against these emails from being marked as SPAM?
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