So your going to create a couple of access-lists if your trying to allow mail in from outside to the DMZ mail server and then have it relay mail to your inside e-mail server. I've created three basic access-lists below one allowing only mail to the DMZ server one allowing the DMZ server to only send mail to the inside mail server and one to allow everything inside out.
People from outside are only connecting to the FE mail server via HTTPS. I already have that configured on the outside acl. My concern is the FE server requestion information fron the BE server. The FE server needs SMTP access to the BE server.
It depend totally on who makes your mail servers and what services you are running. If your front-end is Exchange and you running OWA, POP etc.. you need a bunch of ports open. If you are only routing SMTP with the front end then you should only need SMTP open. You also need to make sure you have good DNS resolution. Let me know and I can try to help.
It is a MS Exchange email server. I was trying to keep the post as simple as possible by just saying smtp. I am aware of the other ports that need to be open on the acl. Im just trying to grasp the concept of the dmz to inside acl. I will take a better look at it now. TY
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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...