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Hi R, I am sure the connection filter is on because only a few IP have someway to &quot;by-pass&quot; 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.
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You are very welcome and I was happy to help
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Hi Experts, <br />
<br />
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. <br />
<br />
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. <br />
<br />
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. <br />
<br />
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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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?

Exchange 2016 SPAM Filtering

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.

AntiSpam

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.