All code for the security devices after 6.3 on the PIX got rid of the fixup and replaced it with application inspection utilizing the application inspection using MQC. Can you explain what the issue is? One of the things you should consider is using esmtp not smtp inspection if your servers are up to the current smtp RFC. that RFC defined the acceptable commands and ESMTP inspection works for them not smtp.
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...