I recently had to turn off the FIXUP SMTP feature because so many servers want to talk ESMTP nowadays. In my case, the fixup was actually interfering with the session startup, even before the HELO command was issued. We were getting lots of timeouts and slow session performance. It was so bad that some servers timed out on the server and delivered it to our ISP's server (which was secondary in the MX record).
It would be nice if Cisco would enhance the fixup command. But ultimately , the email folks will have to allow or deny commands at the server level. In my case, their email platform has granular control over which commands they would accept and which commands they would deny. I thought they would be upset, turns out they didn't have a big problem with it at all.
Login to the FXOS chassis manager.
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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...