Hi There, The main benefit would be against invalid recipients, the ESA will check the rcpt during the SMTP conversation and if the mail is undeliverable can terminate the message their without generating any actual NDR. This helps stop your internal MTA's generating bounces and backscatter on to the internet. The next benefit would be DHAP (Directory Harvest Attacks) stopping spammers harvesting your good known e-mail addresses. And lastly you can use group membership with your current AD/LDAP to create policy set based on user groups
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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...