If i understand you right, you want people to be able to connect to 2 public IPs via a port (say port 25 for this example) and you want both to forward to 1 internal server. Here is what i have done in the past and it seems to work for me:
access-list smtp1 remark MailServer1
access-list smtp1 extended permit tcp host 10.1.1.25 eq smtp any
access-list smtp2 remark MailServer2
access-list smtp2 extended permit tcp host 10.1.1.25 eq smtp any
The above maps the both the public IPs 188.8.131.52 and 184.108.40.206 to 10.1.1.25 on port 25. It is a bit confusing in the documentation. Let me know if this works for you. I know it seems like a strange config, but the problem is the ASA does not like to have 2 globals to 1 local unless you do it with 2 separate ACLs that point to the same local IP :) It's like a workaround type of thing.
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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...