Consider the following:
All traffic (0.0.0.0/0) is NAT'd as 18.104.22.168 (public)
The exchange server has an inbound NAT of 22.214.171.124 (public) > 192.168.1.1 (private).
Now when the exchange server makes a connection to the outside world will it be seen as 126.96.36.199 or 188.8.131.52?
If it is 184.108.40.206, then I must make a reverse NAT rule for all my inbound VIPs to that they respond to INBOUND VIP and are seen as INBOUND VIP.
You can configure STATIC Bidirectional rule for your exchange server so that it cares of both the inbound / outbound connections related to the server. In that case the server would use 220.127.116.11 for outgoing connections. Then below this rule you would place a rule for your internet traffic.
Here is a good doc
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