Over the past week I've noticed a large number of spam not scoring enough to get blocked.
Take for instance last night, there were over 35 emails to various staff members, All the same subject, all for best medical online all with email@example.com with just a single a href url in the body, the highest reputation score that one hit was like a -2.9 alot are in the positives, but I'm seeing more and more of this happening over the past week.
-2.9 should be blocked by reputation filtering. It looks as through the spam is being sent via a bounce method, i.e. spoof your internal address and send messages to another gateway. The bounce will then come back to you internal user with the URL. Two things to do here, first check the reputation of the URL on www.senderbase.org in order to check the validity of it. Second enable bounce verification to ensure that these bounce messages are dropped at the gateway, i.e. if it wasn't sent through your ironport you shouldn't be accepting the bounce.
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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...