nanog mailing list archives

Re: FYI: NANOG Mailing List IPV4 hosts are in Spamhaus RBL


From: John Levine via NANOG <nanog () lists nanog org>
Date: 11 Aug 2025 15:48:20 -0400

It appears that Bryan Fields via NANOG <nanog () lists nanog org> said:
It was showing on the CSS Blocklist, not that it makes much difference. 

Actually it does.  CSS is an automated system that uses a variety of
clues to manage listings.  Some of the clues are quite obscure, e.g.
URLs with domains that use the same name servers as phish URLS (and
yes, they know there are providers with millions of names on the
same servers, they're not stupid.) 

I'm surprised though, the error rate is quite low and it's been a
while since I've seen a false positive like this.

R's,
John
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