Exchange 2016 SPAM Filtering

David_zu
David_zu used Ask the Experts™
on
Hi Experts,

Recently I setup an Exchange 2016 server with Edge Transport server. I configured the IP Block List Providers, and reject emails from Exchange hosted domain (eg. the domain hosted in exchange is myabc.com, I use Set-SenderFilterConfig to block myabc.com. Because internal emails shall be sent to server via SMTPS port 587). all settings are done in Edge Transport Server. However, I still can receive some SPAM mails.

I checked the sender IP from the Agent Log in Edge Transport server, the IP is in the blacklist of IP Block List Provider (eg. spamcop.net). But in the Agent Log, I can see it bypass the IP Block List Providers check up.

All emails' FROM are hosted domain (eg. @myabc.com), which I expect it shall be rejected by Sender Filter Config. However, it actually doesn't work.

I am not sure how these SPAM mails bypass the filters in Edge Transport server. What else shall I do to prevent it?
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Please check whether Connection Filtering agent is enabled on the Edge server by running Get-TransportAgent
Most Valuable Expert 2014
Commented:
"What else shall I do to prevent it? "

Have you already bought your Exchange 2016 licences? If not, then dump the Edge. The built in spam filtering from Microsoft is very poor. Using Blacklists is about the best it can do. For the cost of the server licence (both Windows and Exchange) you can use a third party product or service that will do a much better job, give you better reporting and monitoring and generally be a lot more satisfactory.
Business Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018
Commented:
You should get a proper spam filter. Barracuda is good, Symantec Mail Security for Exchange is good.

We outsource our email at all clients and use suppliers who include top notch spam filtering in their offering.

Author

Commented:
Hi R, I am sure the connection filter is on because only a few IP have someway to "by-pass" the filter. A lot of SPAM is still blocked by connection filter. I will let everyone share the points and close this thread. Thanks for your kindly support.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
You are very welcome and I was happy to help

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