command to rewrite the SMTP responses. The 220 message is a response to the initial socket connection opening. The fixup command rewrites the text component of the response with asterisk so to hide potentially sensitive information, such as the vendor & version of the SMTP server software.
Perhaps the connection is torn down because the subsequent incoming SMTP command is incorrectly interpreted as a hacking attempt?
You might try disabling the pixup protocol smtp 25 command - it has its own problems, with ESMTP for example. You might have to add an ACL entry that allows inbound tcp 25 to your smtp server.
no fixup protocol smtp 25
access-list xyz permit tcp any host mailhost smtp
You might also try posting some information about your config - that might help reveal the source of your problem.
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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...