I'm jumping in on this conversation but am wondering about putting 2 NICs in the mailserver in the DMZ - one NIC to the DMZ and one NIC to the inside. If the server is going to have a connection to the inside network then why even put it in the DMZ? Wouldn't that addition create another route inside your internal network?
I like the idea of putting the mail server in the DMZ or creating a Bastion Host mail server in the DMZ and the real mail server on the inside. If you put the mail server in the DMZ you could just image/ghost it and then not back it up nightly. There really shouldn't be too much data on the server so you could just back it up monthly.
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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...