Spuluka, thanks for the response and AWESOME beard. I actually tried that before posting and it didn't work. It is still translating to the other outgoing subnet interface. I did forget to mention (I updated my original post), that i did setup the 212.24.24.45 address (Email Server #2 as an MIP) on int eth4.
Here is the screenshot: https://www.screencast.com/t/HJs28yT0k
Policy
From Trust To Untrust
192.168.0.45 --> Any
Service: Mail Services / DNS Services
Result
| 2018-02-02 07:13:25 | 192.168.0.45:56616 | 8.8.8.8:53 | 24.24.24.69:4748 | 8.8.8.8:53 | DNS | 3 sec. | 93 | 141 | Close - RESP |