It looks like a subnetting and or routing issue from what you wrote? If your using 10.x.x.x as your inside subnet you will not be able to get to a 192.x.x.x subnet that resides inside the same physical segment as your 10.x.x.x subnet. Your clients will try to send it out your gateway and it will fail. If you have a router outside your gateway and an external dns server with the MX record there you could send the clients outside then back in. I would have to see a drawing of what you have set up to make sure I am on the right track with this. e-mail me offline at email@example.com and I would be glad to take a look and see if I can help.
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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...