F5 SMTP Fast Template - SNAT Not working as expected
I'm having issues with getting SMTP to work with the FAST templates. Specifically, I'm trying to configure an SMTP template with no SNAT option checked so the backend pool members received the original clients IP address, but while running debugs we're seeing the server consistently received traffic with the F5's self IP address.
I'm tried to toggle between checking and unchecking the checkbox in the SMTP FAST template for SNAT and automap, but even when completely disabled the feature and creating a new template, the servers are still seeing the F5 self IP's as the source of traffic. Can anyone suggest what might be the fix here? Below is a SNIP of my configuration:
Note: There is no VLAN filtering, TLS termination, or anyting special very plain vanilla configuration.