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Email Firewall Policy

Created: 06 Nov 2007 • Updated: 21 May 2010 | 1 comment
I'm using SMS for SMTP 5.0.1 with the following licenses enabled:
Antivirus Filtering
Antivirus Content
 
Blocked Senders (Third Party Services) is enabled and set to Reject SMTP connection. I'm using the following:

bl.spamcop.net
dnsbl.sorbs.net
zen.spamhaus.org

 
I notice that ALL junks are delivered to our internal mail server regardless of sender's IP address being on DNSBL or not. The only spam SMS for SMTP blocks is those that I manually add into Blocked Senders (Domain-based) list.
 
Did I misconfigure anything? Thanks in advance.
 
[EDIT]
I think I may have misunderstood how the filter works. If Blocked Senders is set to Reject SMTP connection when sender's IP is on DNSBL, I should see nothing in SMSSMTP tracking log because spammer's connections are rejected. The fact that there are entries in the tracking log tells me that spammer's IP is not found in the DNSBLs that I'm using. Thus, they can connect and spam us.
 
I just changed Blocked Senders setting to "Modify the Subject Line". If I'm right, there should be more entries in the log (and more spam, with modified subject line, arriving in users mailbox). I'll see what happens in a few minutes.



Message Edited by Ronnie J on 11-06-2007 10:23 AM

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Morph27's picture
I was right. I see more entries in SMSSMTP message tracking log with the following info:
 
Disposition: System denied third party domain
Actions: Modify the subject line
 
Blocked Senders (Third Party Services) policy works as expected.