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Spam not scored by rDNS Forward Confirm
Problem reported by kevind - 8/11/2025 at 11:46 AM
Submitted
Receiving a lot of spam today and noticed a particular issue. It's not getting scored by Reverse DNS - Forward Confirm Fail, even though it fails at MultiRBL.org.  Example:
Received: from blazaq.weehdcph.com (demo.srm-deals.x5.ru [85.118.130.83]) by "MyGateway" with SMTP;
   Mon, 11 Aug 2025 12:17:31 -0400
X-SmarterMail-SpamAction: None | NoAction
X-SmarterMail-TotalSpamWeight: 6
Plugging the IP 85.118.130.83 into MultiRBL.org finds a Reverse DNS entry.  But it shows "No record found" for Forward Confirm. This test does work in other situations. Have spammers find a way to get around this check? Thanks!
2
kevind Replied
8/11/2025 at 11:56 AM
Maybe I already did full analysis and posted about this 7 months ago:

Not sure if it's the identical issue with CNAME, but still not working. I'm on a 2024 build. Has it been fixed in a newer build???
1
kevind Replied
Yesterday at 11:17 AM
Continue to see this issue. Spam isn't getting scored by the FCrDNS check.

Got a message today that I won Omaha Steaks. First 2 lines of header:
When I lookup the IP above, it fails FCrDNS, but it isn't scoring in SmarterMail, even though Reverse DNS is enabled with Forward Confirm. Does anyone else see this?
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