To be effective in an Ironport environment, spoofed SPF headers would require at least the name of your Ironport servers to format the SPF record correctly. No matter what, I would expect Ironport to write its own Received-SPF headers regardless of any found in incomming messages.
It is possible for conflicting headers could cause confusion if Ironport does not strip spoofed SPF headers first.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...