Too much spam through the

We use the virtual appliance, Email Security, version 8.0.7.3273. We had a lot of spam that passes through lately and my boss wants me to fix or we will look for an alternative (he got 6 more just as he spoke to me this morning). I already have all levels of aggression the strongest value, and we trained users on the undesirable declaration that comes through using the Outlook addon tool.

Now, I'm looking for using the Services of black list feature. I added zen.spamhaus.org and set it to treat all emails coming from sources on the Services of black list as probable Spam. Are there other services from black list recommended that I should add?

What else can I do to reduce the amount of spam that passes through?

You must check that you effectively solve the RBL, you choose to use.  In my case the Sonicwall is configured to use the DNS default LAN interface, which is my company DNS server; who uses the DNS servers of my ISP as ther forwarders primary.  Many use Google Public DNS.  In both cases, there are reliability problems to access the various RBL.  It is not a server of DNS Public alpha offering efficient access to all RBL, you could use.

https://social.technet.Microsoft.com/forums/ProjectServer/en-us/1252eb3d-949c-4cc3-a1d7-dc08f0bdd372/RBL-not-working-on-Exchange-2013-Edge-Transport?Forum=exchangesvrsecuremessaging

What I've found, is that many ISP/Public DNS Server do not follow the strategies of RBL provider connection limit.  This translates performance very slow to the RBL through the DNS servers of the ISP/Public; leading to RBL expirations on the Sonicwall and other services the customer RBL (in my case as well on the SonicWall) and Exchange Edge Transport.

For me, the solution was to query the RBL zen.spamhaus.org directly, rather than through my server DNS Public/ISP, using Microsoft DNS "Conditional forwarding" on my company DNS server.  I also use separate conditional forwarder at the other RBL, but use the Google Public DNS as the redirection of DNS server.  Just test one that provides the fastest response.

https://TechNet.Microsoft.com/en-us/library/cc794735 (v = ws.10) .aspx

Tags: Dell Tech

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